21002212112 has 80 divisors (see below), whose sum is σ = 46762578432. Its totient is φ = 8951247360.

The previous prime is 21002212093. The next prime is 21002212169. The reversal of 21002212112 is 21121220012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27169358 + ... + 27170130.

Almost surely, 2^21002212112 is an apocalyptic number.

It is an amenable number.

21002212112 is an abundant number, since it is smaller than the sum of its proper divisors (25760366320).

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

21002212112 is a wasteful number, since it uses less digits than its factorization.

21002212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1816 (or 1810 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21002212112 its reverse (21121220012), we get a palindrome (42123432124).

The spelling of 21002212112 in words is "twenty-one billion, two million, two hundred twelve thousand, one hundred twelve".