21002221111010 has 16 divisors (see below), whose sum is σ = 37804270860216. Its totient is φ = 8400827808768.

The previous prime is 21002221111009. The next prime is 21002221111013. The reversal of 21002221111010 is 1011112220012.

It can be written as a sum of positive squares in 4 ways, for example, as 19043265371881 + 1958955739129 = 4363859^2 + 1399627^2 .

It is not an unprimeable number, because it can be changed into a prime (21002221111013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6111167 + ... + 8907906.

Almost surely, 2^{21002221111010} is an apocalyptic number.

21002221111010 is a deficient number, since it is larger than the sum of its proper divisors (16802049749206).

21002221111010 is a wasteful number, since it uses less digits than its factorization.

21002221111010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15158917.

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

Adding to 21002221111010 its reverse (1011112220012), we get a palindrome (22013333331022).

The spelling of 21002221111010 in words is "twenty-one trillion, two billion, two hundred twenty-one million, one hundred eleven thousand, ten".