21131312837490 has 48 divisors (see below), whose sum is σ = 54949323656448. Its totient is φ = 5634205446048.

The previous prime is 21131312837471. The next prime is 21131312837507. The reversal of 21131312837490 is 9473821313112.

21131312837490 is a `hidden beast` number, since 2 + 1 + 1 + 3 + 1 + 3 + 128 + 37 + 490 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 16273602 + ... + 17524061.

It is an arithmetic number, because the mean of its divisors is an integer number (1144777576176).

Almost surely, 2^{21131312837490} is an apocalyptic number.

21131312837490 is an abundant number, since it is smaller than the sum of its proper divisors (33818010818958).

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

21131312837490 is a wasteful number, since it uses less digits than its factorization.

21131312837490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33804623 (or 33804620 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 21131312837490 in words is "twenty-one trillion, one hundred thirty-one billion, three hundred twelve million, eight hundred thirty-seven thousand, four hundred ninety".