20120122222221 has 24 divisors (see below), whose sum is σ = 31212684822144. Its totient is φ = 11495015199360.

The previous prime is 20120122222183. The next prime is 20120122222393. The reversal of 20120122222221 is 12222222102102.

It is not a de Polignac number, because 20120122222221 - 2⁷ = 20120122222093 is a prime.

It is a super-2 number, since 2×20120122222221² (a number of 27 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20120122223221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12308485 + ... + 13846986.

It is an arithmetic number, because the mean of its divisors is an integer number (1300528534256).

Almost surely, 2^{20120122222221} is an apocalyptic number.

20120122222221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20120122222221 is a deficient number, since it is larger than the sum of its proper divisors (11092562599923).

20120122222221 is a wasteful number, since it uses less digits than its factorization.

20120122222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26160721 (or 26160714 counting only the distinct ones).

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

Adding to 20120122222221 its reverse (12222222102102), we get a palindrome (32342344324323).

The spelling of 20120122222221 in words is "twenty trillion, one hundred twenty billion, one hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-one".