20122021021957 has 2 divisors, whose sum is σ = 20122021021958. Its totient is φ = 20122021021956.

The previous prime is 20122021021933. The next prime is 20122021022069. The reversal of 20122021021957 is 75912012022102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14937251035876 + 5184769986081 = 3864874^2 + 2277009^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20122021021957 is a prime.

It is a super-2 number, since 2×20122021021957² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122021021757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061010510978 + 10061010510979.

It is an arithmetic number, because the mean of its divisors is an integer number (10061010510979).

Almost surely, 2^{20122021021957} is an apocalyptic number.

It is an amenable number.

20122021021957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122021021957 is an equidigital number, since it uses as much as digits as its factorization.

20122021021957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 34.

The spelling of 20122021021957 in words is "twenty trillion, one hundred twenty-two billion, twenty-one million, twenty-one thousand, nine hundred fifty-seven".