21887211212 has 24 divisors (see below), whose sum is σ = 38370150000. Its totient is φ = 10924333056.

The previous prime is 21887211211. The next prime is 21887211223. The reversal of 21887211212 is 21211278812.

It is not an unprimeable number, because it can be changed into a prime (21887211211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9356339 + ... + 9358677.

It is an arithmetic number, because the mean of its divisors is an integer number (1598756250).

Almost surely, 2^21887211212 is an apocalyptic number.

It is an amenable number.

21887211212 is a deficient number, since it is larger than the sum of its proper divisors (16482938788).

21887211212 is a wasteful number, since it uses less digits than its factorization.

21887211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5465 (or 5463 counting only the distinct ones).

The product of its digits is 7168, while the sum is 35.

The spelling of 21887211212 in words is "twenty-one billion, eight hundred eighty-seven million, two hundred eleven thousand, two hundred twelve".