321220477 has 2 divisors, whose sum is σ = 321220478. Its totient is φ = 321220476.

The previous prime is 321220433. The next prime is 321220577. The reversal of 321220477 is 774022123.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223981156 + 97239321 = 14966^2 + 9861^2 .

It is a cyclic number.

It is not a de Polignac number, because 321220477 - 2⁷ = 321220349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321220577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610238 + 160610239.

It is an arithmetic number, because the mean of its divisors is an integer number (160610239).

Almost surely, 2^321220477 is an apocalyptic number.

It is an amenable number.

321220477 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220477 is an equidigital number, since it uses as much as digits as its factorization.

321220477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 321220477 is about 17922.6247240743. The cubic root of 321220477 is about 684.8588531175.

The spelling of 321220477 in words is "three hundred twenty-one million, two hundred twenty thousand, four hundred seventy-seven".