221042977 has 2 divisors, whose sum is σ = 221042978. Its totient is φ = 221042976.

The previous prime is 221042971. The next prime is 221043001. The reversal of 221042977 is 779240122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173211921 + 47831056 = 13161^2 + 6916^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221042977 is a prime.

It is not a weakly prime, because it can be changed into another prime (221042971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521488 + 110521489.

It is an arithmetic number, because the mean of its divisors is an integer number (110521489).

Almost surely, 2^221042977 is an apocalyptic number.

It is an amenable number.

221042977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221042977 is an equidigital number, since it uses as much as digits as its factorization.

221042977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 221042977 is about 14867.5141499849. The cubic root of 221042977 is about 604.6335480894.

The spelling of 221042977 in words is "two hundred twenty-one million, forty-two thousand, nine hundred seventy-seven".