20929119961 has 2 divisors, whose sum is σ = 20929119962. Its totient is φ = 20929119960.

The previous prime is 20929119949. The next prime is 20929119971. The reversal of 20929119961 is 16991192902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20929119561 + 400 = 144669^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 20929119961 - 2⁷ = 20929119833 is a prime.

It is not a weakly prime, because it can be changed into another prime (20929119901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10464559980 + 10464559981.

It is an arithmetic number, because the mean of its divisors is an integer number (10464559981).

Almost surely, 2^20929119961 is an apocalyptic number.

It is an amenable number.

20929119961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20929119961 is an equidigital number, since it uses as much as digits as its factorization.

20929119961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 49.

The spelling of 20929119961 in words is "twenty billion, nine hundred twenty-nine million, one hundred nineteen thousand, nine hundred sixty-one".