21002221020122 has 16 divisors (see below), whose sum is σ = 32236706103360. Its totient is φ = 10256663515392.

The previous prime is 21002221020107. The next prime is 21002221020127. The reversal of 21002221020122 is 22102012220012.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21002221020122.

It is not an unprimeable number, because it can be changed into a prime (21002221020127) 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, 1004243 + ... + 6558425.

It is an arithmetic number, because the mean of its divisors is an integer number (2014794131460).

Almost surely, 2^{21002221020122} is an apocalyptic number.

21002221020122 is a deficient number, since it is larger than the sum of its proper divisors (11234485083238).

21002221020122 is a wasteful number, since it uses less digits than its factorization.

21002221020122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5598197.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002221020122 its reverse (22102012220012), we get a palindrome (43104233240134).

The spelling of 21002221020122 in words is "twenty-one trillion, two billion, two hundred twenty-one million, twenty thousand, one hundred twenty-two".