20412241981 has 2 divisors, whose sum is σ = 20412241982. Its totient is φ = 20412241980.

The previous prime is 20412241961. The next prime is 20412242003. The reversal of 20412241981 is 18914221402.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12263569081 + 8148672900 = 110741^2 + 90270^2 .

It is a cyclic number.

It is not a de Polignac number, because 20412241981 - 2⁹ = 20412241469 is a prime.

It is a super-2 number, since 2×20412241981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20412241931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10206120990 + 10206120991.

It is an arithmetic number, because the mean of its divisors is an integer number (10206120991).

Almost surely, 2^20412241981 is an apocalyptic number.

It is an amenable number.

20412241981 is a deficient number, since it is larger than the sum of its proper divisors (1).

20412241981 is an equidigital number, since it uses as much as digits as its factorization.

20412241981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 20412241981 in words is "twenty billion, four hundred twelve million, two hundred forty-one thousand, nine hundred eighty-one".