221250977 has 2 divisors, whose sum is σ = 221250978. Its totient is φ = 221250976.

The previous prime is 221250973. The next prime is 221250979. The reversal of 221250977 is 779052122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220938496 + 312481 = 14864^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 221250977 - 2² = 221250973 is a prime.

Together with 221250979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221250973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110625488 + 110625489.

It is an arithmetic number, because the mean of its divisors is an integer number (110625489).

Almost surely, 2^221250977 is an apocalyptic number.

It is an amenable number.

221250977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221250977 is an equidigital number, since it uses as much as digits as its factorization.

221250977 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 221250977 is about 14874.5076221030. The cubic root of 221250977 is about 604.8231407088.

The spelling of 221250977 in words is "two hundred twenty-one million, two hundred fifty thousand, nine hundred seventy-seven".