1010021221 has 32 divisors (see below), whose sum is σ = 1194393600. Its totient is φ = 843897600.

The previous prime is 1010021213. The next prime is 1010021267. The reversal of 1010021221 is 1221200101.

It is a cyclic number.

It is not a de Polignac number, because 1010021221 - 2³ = 1010021213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1010021198 and 1010021207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1010021021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1685880 + ... + 1686478.

It is an arithmetic number, because the mean of its divisors is an integer number (37324800).

Almost surely, 2^1010021221 is an apocalyptic number.

1010021221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1010021221 is a deficient number, since it is larger than the sum of its proper divisors (184372379).

1010021221 is a wasteful number, since it uses less digits than its factorization.

1010021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1010021221 is about 31780.8310306700. The cubic root of 1010021221 is about 1003.3293103913.

Adding to 1010021221 its reverse (1221200101), we get a palindrome (2231221322).

The spelling of 1010021221 in words is "one billion, ten million, twenty-one thousand, two hundred twenty-one".