21230315253264 has 80 divisors (see below), whose sum is σ = 59088553160000. Its totient is φ = 6529669867008.

The previous prime is 21230315253253. The next prime is 21230315253293. The reversal of 21230315253264 is 46235251303212.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5630014 + ... + 8611485.

It is an arithmetic number, because the mean of its divisors is an integer number (738606914500).

Almost surely, 2^{21230315253264} is an apocalyptic number.

21230315253264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21230315253264 is an abundant number, since it is smaller than the sum of its proper divisors (37858237906736).

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

21230315253264 is a wasteful number, since it uses less digits than its factorization.

21230315253264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243912 (or 14243906 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 39.

Adding to 21230315253264 its reverse (46235251303212), we get a palindrome (67465566556476).

The spelling of 21230315253264 in words is "twenty-one trillion, two hundred thirty billion, three hundred fifteen million, two hundred fifty-three thousand, two hundred sixty-four".