21253100264464 has 40 divisors (see below), whose sum is σ = 41709156871680. Its totient is φ = 10489840297728.

The previous prime is 21253100264441. The next prime is 21253100264467. The reversal of 21253100264464 is 46446200135212.

It is not an unprimeable number, because it can be changed into a prime (21253100264467) 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, 11429644 + ... + 13158379.

It is an arithmetic number, because the mean of its divisors is an integer number (1042728921792).

Almost surely, 2^{21253100264464} is an apocalyptic number.

It is an amenable number.

21253100264464 is a deficient number, since it is larger than the sum of its proper divisors (20456056607216).

21253100264464 is a wasteful number, since it uses less digits than its factorization.

21253100264464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24588727 (or 24588721 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

Adding to 21253100264464 its reverse (46446200135212), we get a palindrome (67699300399676).

The spelling of 21253100264464 in words is "twenty-one trillion, two hundred fifty-three billion, one hundred million, two hundred sixty-four thousand, four hundred sixty-four".