21131111212302 has 96 divisors (see below), whose sum is σ = 54374799159072. Its totient is φ = 5422417572096.

The previous prime is 21131111212279. The next prime is 21131111212303. The reversal of 21131111212302 is 20321211113112.

It is a super-2 number, since 2×21131111212302² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131111212303) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 74572233 + ... + 74855060.

It is an arithmetic number, because the mean of its divisors is an integer number (566404157907).

Almost surely, 2^{21131111212302} is an apocalyptic number.

21131111212302 is an abundant number, since it is smaller than the sum of its proper divisors (33243687946770).

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

21131111212302 is a wasteful number, since it uses less digits than its factorization.

21131111212302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149427362 (or 149427355 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21131111212302 its reverse (20321211113112), we get a palindrome (41452322325414).

The spelling of 21131111212302 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred eleven million, two hundred twelve thousand, three hundred two".