221375711 has 2 divisors, whose sum is σ = 221375712. Its totient is φ = 221375710.

The previous prime is 221375689. The next prime is 221375719. The reversal of 221375711 is 117573122.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221375711 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221375719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110687855 + 110687856.

It is an arithmetic number, because the mean of its divisors is an integer number (110687856).

Almost surely, 2^221375711 is an apocalyptic number.

221375711 is a deficient number, since it is larger than the sum of its proper divisors (1).

221375711 is an equidigital number, since it uses as much as digits as its factorization.

221375711 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2940, while the sum is 29.

The square root of 221375711 is about 14878.6999096023. The cubic root of 221375711 is about 604.9367791325.

The spelling of 221375711 in words is "two hundred twenty-one million, three hundred seventy-five thousand, seven hundred eleven".