20000122111221 has 32 divisors (see below), whose sum is σ = 30497336967168. Its totient is φ = 11420782838400.

The previous prime is 20000122111157. The next prime is 20000122111243. The reversal of 20000122111221 is 12211122100002.

It is not a de Polignac number, because 20000122111221 - 2⁶ = 20000122111157 is a prime.

It is a super-2 number, since 2×20000122111221² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20000122111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000122111261) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 309562321 + ... + 309626921.

It is an arithmetic number, because the mean of its divisors is an integer number (953041780224).

Almost surely, 2^{20000122111221} is an apocalyptic number.

20000122111221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

20000122111221 is a deficient number, since it is larger than the sum of its proper divisors (10497214855947).

20000122111221 is a wasteful number, since it uses less digits than its factorization.

20000122111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74521.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20000122111221 its reverse (12211122100002), we get a palindrome (32211244211223).

It can be divided in two parts, 20000 and 122111221, that added together give a palindrome (122131221).

The spelling of 20000122111221 in words is "twenty trillion, one hundred twenty-two million, one hundred eleven thousand, two hundred twenty-one".