21602635411253 has 36 divisors (see below), whose sum is σ = 24327209345868. Its totient is φ = 19173357665280.

The previous prime is 21602635411241. The next prime is 21602635411271. The reversal of 21602635411253 is 35211453620612.

It can be written as a sum of positive squares in 18 ways, for example, as 20970327359569 + 632308051684 = 4579337^2 + 795178^2 .

It is not a de Polignac number, because 21602635411253 - 2¹⁴ = 21602635394869 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21602635411253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21602635411283) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33937751 + ... + 34568427.

It is an arithmetic number, because the mean of its divisors is an integer number (675755815163).

Almost surely, 2^{21602635411253} is an apocalyptic number.

It is an amenable number.

21602635411253 is a deficient number, since it is larger than the sum of its proper divisors (2724573934615).

21602635411253 is a wasteful number, since it uses less digits than its factorization.

21602635411253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631002 (or 630960 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 21602635411253 in words is "twenty-one trillion, six hundred two billion, six hundred thirty-five million, four hundred eleven thousand, two hundred fifty-three".