221330971 has 2 divisors, whose sum is σ = 221330972. Its totient is φ = 221330970.

The previous prime is 221330957. The next prime is 221331013. The reversal of 221330971 is 179033122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221330971 - 2⁷ = 221330843 is a prime.

It is not a weakly prime, because it can be changed into another prime (221330911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665485 + 110665486.

It is an arithmetic number, because the mean of its divisors is an integer number (110665486).

Almost surely, 2^221330971 is an apocalyptic number.

221330971 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330971 is an equidigital number, since it uses as much as digits as its factorization.

221330971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 221330971 is about 14877.1963420532. The cubic root of 221330971 is about 604.8960238409.

The spelling of 221330971 in words is "two hundred twenty-one million, three hundred thirty thousand, nine hundred seventy-one".