21221111012 has 24 divisors (see below), whose sum is σ = 37520683200. Its totient is φ = 10501043616.

The previous prime is 21221110997. The next prime is 21221111029. The reversal of 21221111012 is 21011112212.

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, 689039 + ... + 719177.

It is an arithmetic number, because the mean of its divisors is an integer number (1563361800).

Almost surely, 2^21221111012 is an apocalyptic number.

It is an amenable number.

21221111012 is a deficient number, since it is larger than the sum of its proper divisors (16299572188).

21221111012 is a wasteful number, since it uses less digits than its factorization.

21221111012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31955 (or 31953 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21221111012 its reverse (21011112212), we get a palindrome (42232223224).

The spelling of 21221111012 in words is "twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, twelve".