21221035312 has 20 divisors (see below), whose sum is σ = 41353424640. Its totient is φ = 10549183808.

The previous prime is 21221035201. The next prime is 21221035369. The reversal of 21221035312 is 21353012212.

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, 3830512 + ... + 3836047.

It is an arithmetic number, because the mean of its divisors is an integer number (2067671232).

Almost surely, 2^21221035312 is an apocalyptic number.

It is an amenable number.

21221035312 is a deficient number, since it is larger than the sum of its proper divisors (20132389328).

21221035312 is a wasteful number, since it uses less digits than its factorization.

21221035312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7666740 (or 7666734 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21221035312 its reverse (21353012212), we get a palindrome (42574047524).

The spelling of 21221035312 in words is "twenty-one billion, two hundred twenty-one million, thirty-five thousand, three hundred twelve".