21253240034562 has 64 divisors (see below), whose sum is σ = 44489323353600. Its totient is φ = 6761315867904.

The previous prime is 21253240034561. The next prime is 21253240034633. The reversal of 21253240034562 is 26543004235212.

It is a self number, because there is not a number n which added to its sum of digits gives 21253240034562.

It is not an unprimeable number, because it can be changed into a prime (21253240034561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50962663 + ... + 51378005.

It is an arithmetic number, because the mean of its divisors is an integer number (695145677400).

Almost surely, 2^{21253240034562} is an apocalyptic number.

21253240034562 is an abundant number, since it is smaller than the sum of its proper divisors (23236083319038).

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

21253240034562 is a wasteful number, since it uses less digits than its factorization.

21253240034562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 419787.

The product of its (nonzero) digits is 345600, while the sum is 39.

Adding to 21253240034562 its reverse (26543004235212), we get a palindrome (47796244269774).

The spelling of 21253240034562 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred forty million, thirty-four thousand, five hundred sixty-two".