21511132313200 has 60 divisors (see below), whose sum is σ = 51684701050008. Its totient is φ = 8603752710400.

The previous prime is 21511132313179. The next prime is 21511132313201. The reversal of 21511132313200 is 231323111512.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21511132313201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2747190 + ... + 7111210.

Almost surely, 2^{21511132313200} is an apocalyptic number.

21511132313200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21511132313200 is an abundant number, since it is smaller than the sum of its proper divisors (30173568736808).

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

21511132313200 is a wasteful number, since it uses less digits than its factorization.

21511132313200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4376362 (or 4376351 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 21511132313200 its reverse (231323111512), we get a palindrome (21742455424712).

The spelling of 21511132313200 in words is "twenty-one trillion, five hundred eleven billion, one hundred thirty-two million, three hundred thirteen thousand, two hundred".