21021220011212 has 48 divisors (see below), whose sum is σ = 38417430304512. Its totient is φ = 10045548744000.

The previous prime is 21021220011203. The next prime is 21021220011227. The reversal of 21021220011212 is 21211002212012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871984463 + ... + 872008569.

It is an arithmetic number, because the mean of its divisors is an integer number (800363131344).

Almost surely, 2^{21021220011212} is an apocalyptic number.

It is an amenable number.

21021220011212 is a deficient number, since it is larger than the sum of its proper divisors (17396210293300).

21021220011212 is a wasteful number, since it uses less digits than its factorization.

21021220011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31358 (or 31356 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021220011212 its reverse (21211002212012), we get a palindrome (42232222223224).

The spelling of 21021220011212 in words is "twenty-one trillion, twenty-one billion, two hundred twenty million, eleven thousand, two hundred twelve".