21255601002602 has 8 divisors (see below), whose sum is σ = 32320160428836. Its totient is φ = 10482214192992.

The previous prime is 21255601002577. The next prime is 21255601002667. The reversal of 21255601002602 is 20620010655212.

It can be written as a sum of positive squares in 2 ways, for example, as 20987659150441 + 267941852161 = 4581229^2 + 517631^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21255601002602² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72793153973 + ... + 72793154264.

Almost surely, 2^{21255601002602} is an apocalyptic number.

21255601002602 is a deficient number, since it is larger than the sum of its proper divisors (11064559426234).

21255601002602 is a wasteful number, since it uses less digits than its factorization.

21255601002602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145586308312.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21255601002602 its reverse (20620010655212), we get a palindrome (41875611657814).

The spelling of 21255601002602 in words is "twenty-one trillion, two hundred fifty-five billion, six hundred one million, two thousand, six hundred two".