21202820212 has 12 divisors (see below), whose sum is σ = 42405640480. Its totient is φ = 9086922936.

The previous prime is 21202820161. The next prime is 21202820251.

21202820212 is nontrivially palindromic in base 10.

21202820212 is an admirable number.

It is a congruent number.

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, 378621762 + ... + 378621817.

Almost surely, 2^21202820212 is an apocalyptic number.

It is an amenable number.

21202820212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21202820212 is a wasteful number, since it uses less digits than its factorization.

21202820212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757243590 (or 757243588 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

The spelling of 21202820212 in words is "twenty-one billion, two hundred two million, eight hundred twenty thousand, two hundred twelve".