21213011212 has 12 divisors (see below), whose sum is σ = 37126851496. Its totient is φ = 10605339360.

The previous prime is 21213011207. The next prime is 21213011221. The reversal of 21213011212 is 21211031212.

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, 249978 + ... + 323905.

Almost surely, 2^21213011212 is an apocalyptic number.

It is an amenable number.

21213011212 is a deficient number, since it is larger than the sum of its proper divisors (15913840284).

21213011212 is a wasteful number, since it uses less digits than its factorization.

21213011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583128 (or 583126 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21213011212 its reverse (21211031212), we get a palindrome (42424042424).

The spelling of 21213011212 in words is "twenty-one billion, two hundred thirteen million, eleven thousand, two hundred twelve".