21312122002012 has 24 divisors (see below), whose sum is σ = 37797573282560. Its totient is φ = 10513024320240.

The previous prime is 21312122002009. The next prime is 21312122002049. The reversal of 21312122002012 is 21020022121312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25712658 + ... + 26528569.

Almost surely, 2^{21312122002012} is an apocalyptic number.

It is an amenable number.

21312122002012 is a deficient number, since it is larger than the sum of its proper divisors (16485451280548).

21312122002012 is a wasteful number, since it uses less digits than its factorization.

21312122002012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52242601 (or 52242599 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21312122002012 its reverse (21020022121312), we get a palindrome (42332144123324).

The spelling of 21312122002012 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-two million, two thousand, twelve".