21200020212 has 24 divisors (see below), whose sum is σ = 56533387456. Its totient is φ = 6057148608.

The previous prime is 21200020181. The next prime is 21200020297. The reversal of 21200020212 is 21202000212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 126190513 + ... + 126190680.

Almost surely, 2^21200020212 is an apocalyptic number.

It is an amenable number.

21200020212 is an abundant number, since it is smaller than the sum of its proper divisors (35333367244).

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

21200020212 is a wasteful number, since it uses less digits than its factorization.

21200020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252381207 (or 252381205 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21200020212 its reverse (21202000212), we get a palindrome (42402020424).

The spelling of 21200020212 in words is "twenty-one billion, two hundred million, twenty thousand, two hundred twelve".