21002221101210 has 64 divisors (see below), whose sum is σ = 51772892494464. Its totient is φ = 5448671712000.

The previous prime is 21002221101181. The next prime is 21002221101223. The reversal of 21002221101210 is 1210112220012.

It is a super-2 number, since 2×21002221101210² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21002221101210.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10034605 + ... + 11945615.

It is an arithmetic number, because the mean of its divisors is an integer number (808951445226).

Almost surely, 2^{21002221101210} is an apocalyptic number.

21002221101210 is an abundant number, since it is smaller than the sum of its proper divisors (30770671393254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21002221101210 is a wasteful number, since it uses less digits than its factorization.

21002221101210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1920959.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21002221101210 its reverse (1210112220012), we get a palindrome (22212333321222).

The spelling of 21002221101210 in words is "twenty-one trillion, two billion, two hundred twenty-one million, one hundred one thousand, two hundred ten".