21976057 has 2 divisors, whose sum is σ = 21976058. Its totient is φ = 21976056.

The previous prime is 21976037. The next prime is 21976069. The reversal of 21976057 is 75067912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 8404201 = 3684^2 + 2899^2 .

It is a cyclic number.

It is not a de Polignac number, because 21976057 - 2⁷ = 21975929 is a prime.

It is not a weakly prime, because it can be changed into another prime (21976007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10988028 + 10988029.

It is an arithmetic number, because the mean of its divisors is an integer number (10988029).

Almost surely, 2^21976057 is an apocalyptic number.

It is an amenable number.

21976057 is a deficient number, since it is larger than the sum of its proper divisors (1).

21976057 is an equidigital number, since it uses as much as digits as its factorization.

21976057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 21976057 is about 4687.8627326320. The cubic root of 21976057 is about 280.1022458223.

The spelling of 21976057 in words is "twenty-one million, nine hundred seventy-six thousand, fifty-seven".