21220202012 has 12 divisors (see below), whose sum is σ = 37137444960. Its totient is φ = 10609503456.

The previous prime is 21220201999. The next prime is 21220202039. The reversal of 21220202012 is 21020202212.

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, 64073 + ... + 215744.

It is an arithmetic number, because the mean of its divisors is an integer number (3094787080).

Almost surely, 2^21220202012 is an apocalyptic number.

It is an amenable number.

21220202012 is a deficient number, since it is larger than the sum of its proper divisors (15917242948).

21220202012 is a wasteful number, since it uses less digits than its factorization.

21220202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298780 (or 298778 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 21220202012 its reverse (21020202212), we get a palindrome (42240404224).

The spelling of 21220202012 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, twelve".