221010971 has 2 divisors, whose sum is σ = 221010972. Its totient is φ = 221010970.

The previous prime is 221010949. The next prime is 221011057. The reversal of 221010971 is 179010122.

221010971 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221010971 - 2²⁶ = 153902107 is a prime.

It is not a weakly prime, because it can be changed into another prime (221010271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110505485 + 110505486.

It is an arithmetic number, because the mean of its divisors is an integer number (110505486).

Almost surely, 2^221010971 is an apocalyptic number.

221010971 is a deficient number, since it is larger than the sum of its proper divisors (1).

221010971 is an equidigital number, since it uses as much as digits as its factorization.

221010971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 221010971 is about 14866.4377374003. The cubic root of 221010971 is about 604.6043639677.

The spelling of 221010971 in words is "two hundred twenty-one million, ten thousand, nine hundred seventy-one".