21021020202122 has 16 divisors (see below), whose sum is σ = 31930854739200. Its totient is φ = 10377403548720.

The previous prime is 21021020202109. The next prime is 21021020202167. The reversal of 21021020202122 is 22120202012012.

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 21021020202122.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37394372 + ... + 37952352.

It is an arithmetic number, because the mean of its divisors is an integer number (1995678421200).

Almost surely, 2^{21021020202122} is an apocalyptic number.

21021020202122 is a deficient number, since it is larger than the sum of its proper divisors (10909834537078).

21021020202122 is a wasteful number, since it uses less digits than its factorization.

21021020202122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796501.

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

Adding to 21021020202122 its reverse (22120202012012), we get a palindrome (43141222214134).

The spelling of 21021020202122 in words is "twenty-one trillion, twenty-one billion, twenty million, two hundred two thousand, one hundred twenty-two".