21133100131231 has 4 divisors (see below), whose sum is σ = 23054291052264. Its totient is φ = 19211909210200.

The previous prime is 21133100131223. The next prime is 21133100131249. The reversal of 21133100131231 is 13213100133112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21133100131231 - 2³ = 21133100131223 is a prime.

It is a super-2 number, since 2×21133100131231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133100131211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960595460500 + ... + 960595460521.

It is an arithmetic number, because the mean of its divisors is an integer number (5763572763066).

Almost surely, 2^{21133100131231} is an apocalyptic number.

21133100131231 is a deficient number, since it is larger than the sum of its proper divisors (1921190921033).

21133100131231 is a wasteful number, since it uses less digits than its factorization.

21133100131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921190921032.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21133100131231 its reverse (13213100133112), we get a palindrome (34346200264343).

The spelling of 21133100131231 in words is "twenty-one trillion, one hundred thirty-three billion, one hundred million, one hundred thirty-one thousand, two hundred thirty-one".