21131340234312 has 64 divisors (see below), whose sum is σ = 65863917619200. Its totient is φ = 5488659800640.

The previous prime is 21131340234307. The next prime is 21131340234343. The reversal of 21131340234312 is 21343204313112.

It is a super-2 number, since 2×21131340234312² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21131340234312.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5717352112 + ... + 5717355807.

It is an arithmetic number, because the mean of its divisors is an integer number (1029123712800).

Almost surely, 2^{21131340234312} is an apocalyptic number.

21131340234312 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21131340234312 is an abundant number, since it is smaller than the sum of its proper divisors (44732577384888).

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

21131340234312 is a wasteful number, since it uses less digits than its factorization.

21131340234312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11434707946 (or 11434707942 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 21131340234312 its reverse (21343204313112), we get a palindrome (42474544547424).

The spelling of 21131340234312 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred forty million, two hundred thirty-four thousand, three hundred twelve".