21002312212 has 24 divisors (see below), whose sum is σ = 42009437120. Its totient is φ = 8999959680.

The previous prime is 21002312203. The next prime is 21002312239. The reversal of 21002312212 is 21221320012.

It is a happy number.

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, 238012 + ... + 314092.

Almost surely, 2^21002312212 is an apocalyptic number.

It is an amenable number.

21002312212 is an abundant number, since it is smaller than the sum of its proper divisors (21007124908).

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

21002312212 is a wasteful number, since it uses less digits than its factorization.

21002312212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85951 (or 85949 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21002312212 its reverse (21221320012), we get a palindrome (42223632224).

The spelling of 21002312212 in words is "twenty-one billion, two million, three hundred twelve thousand, two hundred twelve".