122222220120021 has 16 divisors (see below), whose sum is σ = 187272352012928. Its totient is φ = 69455405275200.

The previous prime is 122222220119963. The next prime is 122222220120041. The reversal of 122222220120021 is 120021022222221.

It is not a de Polignac number, because 122222220120021 - 2¹⁹ = 122222219595733 is a prime.

It is a super-2 number, since 2×122222220120021² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 122222220120021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122222220120041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16077636310 + ... + 16077643911.

It is an arithmetic number, because the mean of its divisors is an integer number (11704522000808).

Almost surely, 2^{122222220120021} is an apocalyptic number.

It is an amenable number.

122222220120021 is a deficient number, since it is larger than the sum of its proper divisors (65050131892907).

122222220120021 is a wasteful number, since it uses less digits than its factorization.

122222220120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32155280412.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 122222220120021 its reverse (120021022222221), we get a palindrome (242243242342242).

The spelling of 122222220120021 in words is "one hundred twenty-two trillion, two hundred twenty-two billion, two hundred twenty million, one hundred twenty thousand, twenty-one".