21620474253526 has 16 divisors (see below), whose sum is σ = 34137737991360. Its totient is φ = 10241233158600.

The previous prime is 21620474253523. The next prime is 21620474253541. The reversal of 21620474253526 is 62535247402612.

It is a self number, because there is not a number n which added to its sum of digits gives 21620474253526.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620474253523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770101 + ... + 10961551.

It is an arithmetic number, because the mean of its divisors is an integer number (2133608624460).

Almost surely, 2^{21620474253526} is an apocalyptic number.

21620474253526 is a deficient number, since it is larger than the sum of its proper divisors (12517263737834).

21620474253526 is a wasteful number, since it uses less digits than its factorization.

21620474253526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451099.

The product of its (nonzero) digits is 4838400, while the sum is 49.

The spelling of 21620474253526 in words is "twenty-one trillion, six hundred twenty billion, four hundred seventy-four million, two hundred fifty-three thousand, five hundred twenty-six".