221057411 has 2 divisors, whose sum is σ = 221057412. Its totient is φ = 221057410.

The previous prime is 221057383. The next prime is 221057429. The reversal of 221057411 is 114750122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221057411 - 2²² = 216863107 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221057611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110528705 + 110528706.

It is an arithmetic number, because the mean of its divisors is an integer number (110528706).

Almost surely, 2^221057411 is an apocalyptic number.

221057411 is a deficient number, since it is larger than the sum of its proper divisors (1).

221057411 is an equidigital number, since it uses as much as digits as its factorization.

221057411 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 23.

The square root of 221057411 is about 14867.9995628195. Note that the first 3 decimals coincide. The cubic root of 221057411 is about 604.6467085629.

Subtracting from 221057411 its product of nonzero digits (560), we obtain a triangular number (221056851 = T₂₁₀₂₆).

The spelling of 221057411 in words is "two hundred twenty-one million, fifty-seven thousand, four hundred eleven".