21002122220010 has 32 divisors (see below), whose sum is σ = 51115024225152. Its totient is φ = 5521684714560.

The previous prime is 21002122219999. The next prime is 21002122220033. The reversal of 21002122220010 is 1002222120012.

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

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, 4930073509 + ... + 4930077768.

It is an arithmetic number, because the mean of its divisors is an integer number (1597344507036).

Almost surely, 2^{21002122220010} is an apocalyptic number.

21002122220010 is an abundant number, since it is smaller than the sum of its proper divisors (30112902005142).

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

21002122220010 is a wasteful number, since it uses less digits than its factorization.

21002122220010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9860151358.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002122220010 its reverse (1002222120012), we get a palindrome (22004344340022).

The spelling of 21002122220010 in words is "twenty-one trillion, two billion, one hundred twenty-two million, two hundred twenty thousand, ten".