221081933 has 2 divisors, whose sum is σ = 221081934. Its totient is φ = 221081932.

The previous prime is 221081897. The next prime is 221081941. The reversal of 221081933 is 339180122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178008964 + 43072969 = 13342^2 + 6563^2 .

It is a cyclic number.

It is not a de Polignac number, because 221081933 - 2²⁴ = 204304717 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221081896 and 221081905.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221081983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110540966 + 110540967.

It is an arithmetic number, because the mean of its divisors is an integer number (110540967).

Almost surely, 2^221081933 is an apocalyptic number.

It is an amenable number.

221081933 is a deficient number, since it is larger than the sum of its proper divisors (1).

221081933 is an equidigital number, since it uses as much as digits as its factorization.

221081933 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 221081933 is about 14868.8241969565. The cubic root of 221081933 is about 604.6690656484.

The spelling of 221081933 in words is "two hundred twenty-one million, eighty-one thousand, nine hundred thirty-three".