21211022120122 has 4 divisors (see below), whose sum is σ = 31816533180186. Its totient is φ = 10605511060060.

The previous prime is 21211022120083. The next prime is 21211022120177. The reversal of 21211022120122 is 22102122011212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12802234276441 + 8408787843681 = 3578021^2 + 2899791^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21211022120122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5302755530029 + ... + 5302755530032.

Almost surely, 2^{21211022120122} is an apocalyptic number.

21211022120122 is a deficient number, since it is larger than the sum of its proper divisors (10605511060064).

21211022120122 is a wasteful number, since it uses less digits than its factorization.

21211022120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10605511060063.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21211022120122 its reverse (22102122011212), we get a palindrome (43313144131334).

The spelling of 21211022120122 in words is "twenty-one trillion, two hundred eleven billion, twenty-two million, one hundred twenty thousand, one hundred twenty-two".