21220221211012 has 12 divisors (see below), whose sum is σ = 39089881178320. Its totient is φ = 10051683731496.

The previous prime is 21220221210967. The next prime is 21220221211043. The reversal of 21220221211012 is 21011212202212.

It is a Harshad number since it is a multiple of its sum of digits (19).

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, 139606718418 + ... + 139606718569.

Almost surely, 2^{21220221211012} is an apocalyptic number.

It is an amenable number.

21220221211012 is a deficient number, since it is larger than the sum of its proper divisors (17869659967308).

21220221211012 is a wasteful number, since it uses less digits than its factorization.

21220221211012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279213437010 (or 279213437008 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21220221211012 its reverse (21011212202212), we get a palindrome (42231433413224).

The spelling of 21220221211012 in words is "twenty-one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred eleven thousand, twelve".