221330312977 has 2 divisors, whose sum is σ = 221330312978. Its totient is φ = 221330312976.

The previous prime is 221330312947. The next prime is 221330313053. The reversal of 221330312977 is 779213033122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130979571921 + 90350741056 = 361911^2 + 300584^2 .

It is a cyclic number.

It is not a de Polignac number, because 221330312977 - 2³¹ = 219182829329 is a prime.

It is not a weakly prime, because it can be changed into another prime (221330312947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110665156488 + 110665156489.

It is an arithmetic number, because the mean of its divisors is an integer number (110665156489).

Almost surely, 2^221330312977 is an apocalyptic number.

It is an amenable number.

221330312977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221330312977 is an equidigital number, since it uses as much as digits as its factorization.

221330312977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 40.

The spelling of 221330312977 in words is "two hundred twenty-one billion, three hundred thirty million, three hundred twelve thousand, nine hundred seventy-seven".