221022973 has 2 divisors, whose sum is σ = 221022974. Its totient is φ = 221022972.

The previous prime is 221022943. The next prime is 221022979. The reversal of 221022973 is 379220122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219099204 + 1923769 = 14802^2 + 1387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221022973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221022979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110511486 + 110511487.

It is an arithmetic number, because the mean of its divisors is an integer number (110511487).

Almost surely, 2^221022973 is an apocalyptic number.

It is an amenable number.

221022973 is a deficient number, since it is larger than the sum of its proper divisors (1).

221022973 is an equidigital number, since it uses as much as digits as its factorization.

221022973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 221022973 is about 14866.8413928447. The cubic root of 221022973 is about 604.6153081156.

The spelling of 221022973 in words is "two hundred twenty-one million, twenty-two thousand, nine hundred seventy-three".