2021591263402 has 16 divisors (see below), whose sum is σ = 3048978493512. Its totient is φ = 1005279828480.

The previous prime is 2021591263399. The next prime is 2021591263487. The reversal of 2021591263402 is 2043621951202.

It can be written as a sum of positive squares in 4 ways, for example, as 584232451201 + 1437358812201 = 764351^2 + 1198899^2 .

It is a super-2 number, since 2×2021591263402² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3407499 + ... + 3956542.

Almost surely, 2^{2021591263402} is an apocalyptic number.

2021591263402 is a deficient number, since it is larger than the sum of its proper divisors (1027387230110).

2021591263402 is a wasteful number, since it uses less digits than its factorization.

2021591263402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7364793.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 2021591263402 in words is "two trillion, twenty-one billion, five hundred ninety-one million, two hundred sixty-three thousand, four hundred two".