321220087 has 2 divisors, whose sum is σ = 321220088. Its totient is φ = 321220086.

The previous prime is 321220073. The next prime is 321220103. The reversal of 321220087 is 780022123.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-321220087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321220187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160610043 + 160610044.

It is an arithmetic number, because the mean of its divisors is an integer number (160610044).

Almost surely, 2^321220087 is an apocalyptic number.

321220087 is a deficient number, since it is larger than the sum of its proper divisors (1).

321220087 is an equidigital number, since it uses as much as digits as its factorization.

321220087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 321220087 is about 17922.6138439682. The cubic root of 321220087 is about 684.8585759506.

The spelling of 321220087 in words is "three hundred twenty-one million, two hundred twenty thousand, eighty-seven".