20021122122111 has 24 divisors (see below), whose sum is σ = 31809165744720. Its totient is φ = 12134013400080.

The previous prime is 20021122122083. The next prime is 20021122122149. The reversal of 20021122122111 is 11122122112002.

20021122122111 is a `hidden beast` number, since 2 + 0 + 0 + 211 + 221 + 221 + 11 = 666.

It is not a de Polignac number, because 20021122122111 - 2⁹ = 20021122121599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021122121111) 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, 835663876 + ... + 835687833.

It is an arithmetic number, because the mean of its divisors is an integer number (1325381906030).

Almost surely, 2^{20021122122111} is an apocalyptic number.

20021122122111 is a deficient number, since it is larger than the sum of its proper divisors (11788043622609).

20021122122111 is a wasteful number, since it uses less digits than its factorization.

20021122122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671351748 (or 1671351723 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 20021122122111 its reverse (11122122112002), we get a palindrome (31143244234113).

It can be divided in two parts, 200211 and 22122111, that added together give a palindrome (22322322).

The spelling of 20021122122111 in words is "twenty trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one hundred eleven".