221043959 has 2 divisors, whose sum is σ = 221043960. Its totient is φ = 221043958.

The previous prime is 221043941. The next prime is 221043983. The reversal of 221043959 is 959340122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221043959 - 2²⁰ = 219995383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221043989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521979 + 110521980.

It is an arithmetic number, because the mean of its divisors is an integer number (110521980).

Almost surely, 2^221043959 is an apocalyptic number.

221043959 is a deficient number, since it is larger than the sum of its proper divisors (1).

221043959 is an equidigital number, since it uses as much as digits as its factorization.

221043959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 221043959 is about 14867.5471749714. The cubic root of 221043959 is about 604.6344434647.

The spelling of 221043959 in words is "two hundred twenty-one million, forty-three thousand, nine hundred fifty-nine".