22012121081 has 2 divisors, whose sum is σ = 22012121082. Its totient is φ = 22012121080.

The previous prime is 22012121071. The next prime is 22012121147. The reversal of 22012121081 is 18012121022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19275157225 + 2736963856 = 138835^2 + 52316^2 .

It is a cyclic number.

It is not a de Polignac number, because 22012121081 - 2⁶ = 22012121017 is a prime.

It is a super-2 number, since 2×22012121081² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22012121071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11006060540 + 11006060541.

It is an arithmetic number, because the mean of its divisors is an integer number (11006060541).

Almost surely, 2^22012121081 is an apocalyptic number.

It is an amenable number.

22012121081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22012121081 is an equidigital number, since it uses as much as digits as its factorization.

22012121081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 20.

The spelling of 22012121081 in words is "twenty-two billion, twelve million, one hundred twenty-one thousand, eighty-one".