21131103122312 has 16 divisors (see below), whose sum is σ = 39621299850000. Its totient is φ = 10565423162320.

The previous prime is 21131103122303. The next prime is 21131103122329. The reversal of 21131103122312 is 21322130113112.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15348614 + ... + 16668597.

It is an arithmetic number, because the mean of its divisors is an integer number (2476331240625).

Almost surely, 2^{21131103122312} is an apocalyptic number.

It is an amenable number.

21131103122312 is a deficient number, since it is larger than the sum of its proper divisors (18490196727688).

21131103122312 is a wasteful number, since it uses less digits than its factorization.

21131103122312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32099716 (or 32099712 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21131103122312 its reverse (21322130113112), we get a palindrome (42453233235424).

The spelling of 21131103122312 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred three million, one hundred twenty-two thousand, three hundred twelve".