1031000021 has 16 divisors (see below), whose sum is σ = 1109384640. Its totient is φ = 955267200.

The previous prime is 1030999993. The next prime is 1031000023. The reversal of 1031000021 is 1200001301.

It is a cyclic number.

It is not a de Polignac number, because 1031000021 - 2²⁶ = 963891157 is a prime.

It is a super-2 number, since 2×1031000021² = 2125922086604000882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1030999972 and 1031000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1031000023) 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, 156041 + ... + 162513.

It is an arithmetic number, because the mean of its divisors is an integer number (69336540).

Almost surely, 2^1031000021 is an apocalyptic number.

It is an amenable number.

1031000021 is a deficient number, since it is larger than the sum of its proper divisors (78384619).

1031000021 is a wasteful number, since it uses less digits than its factorization.

1031000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6676.

The product of its (nonzero) digits is 6, while the sum is 8.

The square root of 1031000021 is about 32109.1890430138. The cubic root of 1031000021 is about 1010.2283642038.

Adding to 1031000021 its reverse (1200001301), we get a palindrome (2231001322).

The spelling of 1031000021 in words is "one billion, thirty-one million, twenty-one", and thus it is an aban number and an uban number.