1051020221 has 4 divisors (see below), whose sum is σ = 1051586844. Its totient is φ = 1050453600.

The previous prime is 1051020203. The next prime is 1051020239. The reversal of 1051020221 is 1220201501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1220201501 = 6263 ⋅194827.

It is an interprime number because it is at equal distance from previous prime (1051020203) and next prime (1051020239).

It can be written as a sum of positive squares in 2 ways, for example, as 361380100 + 689640121 = 19010^2 + 26261^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051020221 - 2¹⁰ = 1051019197 is a prime.

It is a super-2 number, since 2×1051020221² = 2209287009901777682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1051020196 and 1051020205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1051020821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280520 + ... + 284241.

It is an arithmetic number, because the mean of its divisors is an integer number (262896711).

Almost surely, 2^1051020221 is an apocalyptic number.

It is an amenable number.

1051020221 is a deficient number, since it is larger than the sum of its proper divisors (566623).

1051020221 is an equidigital number, since it uses as much as digits as its factorization.

1051020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566622.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1051020221 is about 32419.4420217252. The cubic root of 1051020221 is about 1016.7254403838.

Adding to 1051020221 its reverse (1220201501), we get a palindrome (2271221722).

The spelling of 1051020221 in words is "one billion, fifty-one million, twenty thousand, two hundred twenty-one".