1056432221 has 16 divisors (see below), whose sum is σ = 1159019568. Its totient is φ = 956966400.

The previous prime is 1056432197. The next prime is 1056432227. The reversal of 1056432221 is 1222346501.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 379860100 + 676572121 = 19490^2 + 26011^2 .

It is not a de Polignac number, because 1056432221 - 2¹⁰ = 1056431197 is a prime.

It is a super-2 number, since 2×1056432221² = 2232098075133985682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1056432227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411875 + ... + 414431.

It is an arithmetic number, because the mean of its divisors is an integer number (72438723).

Almost surely, 2^1056432221 is an apocalyptic number.

It is an amenable number.

1056432221 is a deficient number, since it is larger than the sum of its proper divisors (102587347).

1056432221 is a wasteful number, since it uses less digits than its factorization.

1056432221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 1056432221 is about 32502.8032791019. The cubic root of 1056432221 is about 1018.4675890207.

Adding to 1056432221 its reverse (1222346501), we get a palindrome (2278778722).

The spelling of 1056432221 in words is "one billion, fifty-six million, four hundred thirty-two thousand, two hundred twenty-one".