21021012212 has 12 divisors (see below), whose sum is σ = 36791109600. Its totient is φ = 10509266616.

The previous prime is 21021012203. The next prime is 21021012247. The reversal of 21021012212 is 21221012012.

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, 271178 + ... + 339969.

It is an arithmetic number, because the mean of its divisors is an integer number (3065925800).

Almost surely, 2^21021012212 is an apocalyptic number.

It is an amenable number.

21021012212 is a deficient number, since it is larger than the sum of its proper divisors (15770097388).

21021012212 is a wasteful number, since it uses less digits than its factorization.

21021012212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619750 (or 619748 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21021012212 its reverse (21221012012), we get a palindrome (42242024224).

The spelling of 21021012212 in words is "twenty-one billion, twenty-one million, twelve thousand, two hundred twelve".