21210112012 has 72 divisors (see below), whose sum is σ = 38805516288. Its totient is φ = 10140530400.

The previous prime is 21210112003. The next prime is 21210112031. The reversal of 21210112012 is 21021101212.

It is a junction number, because it is equal to n+sod(n) for n = 21210111983 and 21210112001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 161909187 + ... + 161909317.

It is an arithmetic number, because the mean of its divisors is an integer number (538965504).

Almost surely, 2^21210112012 is an apocalyptic number.

It is an amenable number.

21210112012 is a deficient number, since it is larger than the sum of its proper divisors (17595404276).

21210112012 is a wasteful number, since it uses less digits than its factorization.

21210112012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 398 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210112012 its reverse (21021101212), we get a palindrome (42231213224).

The spelling of 21210112012 in words is "twenty-one billion, two hundred ten million, one hundred twelve thousand, twelve".