321421897 has 2 divisors, whose sum is σ = 321421898. Its totient is φ = 321421896.

The previous prime is 321421883. The next prime is 321421909. The reversal of 321421897 is 798124123.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241211961 + 80209936 = 15531^2 + 8956^2 .

It is a cyclic number.

It is not a de Polignac number, because 321421897 - 2⁷ = 321421769 is a prime.

It is not a weakly prime, because it can be changed into another prime (321421817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160710948 + 160710949.

It is an arithmetic number, because the mean of its divisors is an integer number (160710949).

Almost surely, 2^321421897 is an apocalyptic number.

It is an amenable number.

321421897 is a deficient number, since it is larger than the sum of its proper divisors (1).

321421897 is an equidigital number, since it uses as much as digits as its factorization.

321421897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 37.

The square root of 321421897 is about 17928.2429981301. The cubic root of 321421897 is about 685.0019691989.

The spelling of 321421897 in words is "three hundred twenty-one million, four hundred twenty-one thousand, eight hundred ninety-seven".