21253213631133 has 96 divisors (see below), whose sum is σ = 35097753600000. Its totient is φ = 12267316131840.

The previous prime is 21253213631129. The next prime is 21253213631137. The reversal of 21253213631133 is 33113631235212.

21253213631133 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 3 + 2 + 1 + 3 + 631 + 13 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21253213631129) and next prime (21253213631137).

It is not a de Polignac number, because 21253213631133 - 2² = 21253213631129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21253213631137) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 489694968 + ... + 489738366.

It is an arithmetic number, because the mean of its divisors is an integer number (365601600000).

Almost surely, 2^{21253213631133} is an apocalyptic number.

21253213631133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21253213631133 is a deficient number, since it is larger than the sum of its proper divisors (13844539968867).

21253213631133 is a wasteful number, since it uses less digits than its factorization.

21253213631133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44367 (or 44364 counting only the distinct ones).

The product of its digits is 58320, while the sum is 36.

Adding to 21253213631133 its reverse (33113631235212), we get a palindrome (54366844866345).

The spelling of 21253213631133 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred thirteen million, six hundred thirty-one thousand, one hundred thirty-three".