321021980 has 24 divisors (see below), whose sum is σ = 678288912. Its totient is φ = 127619712.

The previous prime is 321021977. The next prime is 321021989. The reversal of 321021980 is 89120123.

It is a super-2 number, since 2×321021980² = 206110223286240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321021989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45977 + ... + 52496.

It is an arithmetic number, because the mean of its divisors is an integer number (28262038).

Almost surely, 2^321021980 is an apocalyptic number.

It is an amenable number.

321021980 is an abundant number, since it is smaller than the sum of its proper divisors (357266932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

321021980 is a wasteful number, since it uses less digits than its factorization.

321021980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98645 (or 98643 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 321021980 is about 17917.0862586527. The cubic root of 321021980 is about 684.7177553889.

The spelling of 321021980 in words is "three hundred twenty-one million, twenty-one thousand, nine hundred eighty".