21131312837492 has 144 divisors (see below), whose sum is σ = 46032419361600. Its totient is φ = 8390544814080.

The previous prime is 21131312837471. The next prime is 21131312837507. The reversal of 21131312837492 is 29473821313112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 131172338 + ... + 131333334.

It is an arithmetic number, because the mean of its divisors is an integer number (319669578900).

Almost surely, 2^{21131312837492} is an apocalyptic number.

21131312837492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21131312837492 is an abundant number, since it is smaller than the sum of its proper divisors (24901106524108).

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

21131312837492 is a wasteful number, since it uses less digits than its factorization.

21131312837492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161986 (or 161971 counting only the distinct ones).

The product of its digits is 435456, while the sum is 47.

The spelling of 21131312837492 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred twelve million, eight hundred thirty-seven thousand, four hundred ninety-two".