1021971402 has 24 divisors (see below), whose sum is σ = 2214859140. Its totient is φ = 340566720.

The previous prime is 1021971343. The next prime is 1021971421. The reversal of 1021971402 is 2041791201.

It can be written as a sum of positive squares in 2 ways, for example, as 928481841 + 93489561 = 30471^2 + 9669^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131752 + ... + 139292.

Almost surely, 2^1021971402 is an apocalyptic number.

1021971402 is an abundant number, since it is smaller than the sum of its proper divisors (1192887738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021971402 is a wasteful number, since it uses less digits than its factorization.

1021971402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15078 (or 15075 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1021971402 is about 31968.2874424014. The cubic root of 1021971402 is about 1007.2708078963.

The spelling of 1021971402 in words is "one billion, twenty-one million, nine hundred seventy-one thousand, four hundred two".