20110421957 has 2 divisors, whose sum is σ = 20110421958. Its totient is φ = 20110421956.

The previous prime is 20110421951. The next prime is 20110422001. The reversal of 20110421957 is 75912401102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18326119876 + 1784302081 = 135374^2 + 42241^2 .

It is a cyclic number.

It is not a de Polignac number, because 20110421957 - 2³⁰ = 19036680133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20110421951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055210978 + 10055210979.

It is an arithmetic number, because the mean of its divisors is an integer number (10055210979).

Almost surely, 2^20110421957 is an apocalyptic number.

It is an amenable number.

20110421957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20110421957 is an equidigital number, since it uses as much as digits as its factorization.

20110421957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 32.

The spelling of 20110421957 in words is "twenty billion, one hundred ten million, four hundred twenty-one thousand, nine hundred fifty-seven".