20220112121981 has 2 divisors, whose sum is σ = 20220112121982. Its totient is φ = 20220112121980.

The previous prime is 20220112121971. The next prime is 20220112122029. The reversal of 20220112121981 is 18912121102202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16552619017081 + 3667493104900 = 4068491^2 + 1915070^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220112121981 - 2⁶ = 20220112121917 is a prime.

It is a super-2 number, since 2×20220112121981² (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 (20220112121971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110056060990 + 10110056060991.

It is an arithmetic number, because the mean of its divisors is an integer number (10110056060991).

Almost surely, 2^{20220112121981} is an apocalyptic number.

It is an amenable number.

20220112121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220112121981 is an equidigital number, since it uses as much as digits as its factorization.

20220112121981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 32.

The spelling of 20220112121981 in words is "twenty trillion, two hundred twenty billion, one hundred twelve million, one hundred twenty-one thousand, nine hundred eighty-one".