221079977 has 2 divisors, whose sum is σ = 221079978. Its totient is φ = 221079976.

The previous prime is 221079959. The next prime is 221080001. The reversal of 221079977 is 779970122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170328601 + 50751376 = 13051^2 + 7124^2 .

It is a cyclic number.

It is not a de Polignac number, because 221079977 - 2²⁰ = 220031401 is a prime.

It is not a weakly prime, because it can be changed into another prime (221070977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110539988 + 110539989.

It is an arithmetic number, because the mean of its divisors is an integer number (110539989).

Almost surely, 2^221079977 is an apocalyptic number.

It is an amenable number.

221079977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221079977 is an equidigital number, since it uses as much as digits as its factorization.

221079977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 221079977 is about 14868.7584216033. The cubic root of 221079977 is about 604.6672823937.

The spelling of 221079977 in words is "two hundred twenty-one million, seventy-nine thousand, nine hundred seventy-seven".