1026402221 has 4 divisors (see below), whose sum is σ = 1105356252. Its totient is φ = 947448192.

The previous prime is 1026402197. The next prime is 1026402227. The reversal of 1026402221 is 1222046201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222046201 = 47 ⋅26000983.

It can be written as a sum of positive squares in 2 ways, for example, as 692426596 + 333975625 = 26314^2 + 18275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1026402221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1026402193 and 1026402202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1026402227) 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, 39476996 + ... + 39477021.

It is an arithmetic number, because the mean of its divisors is an integer number (276339063).

Almost surely, 2^1026402221 is an apocalyptic number.

It is an amenable number.

1026402221 is a deficient number, since it is larger than the sum of its proper divisors (78954031).

1026402221 is an equidigital number, since it uses as much as digits as its factorization.

1026402221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78954030.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1026402221 is about 32037.5127155652. The cubic root of 1026402221 is about 1008.7244037591.

Adding to 1026402221 its reverse (1222046201), we get a palindrome (2248448422).

The spelling of 1026402221 in words is "one billion, twenty-six million, four hundred two thousand, two hundred twenty-one".