321956421 has 16 divisors (see below), whose sum is σ = 469191168. Its totient is φ = 195494400.

The previous prime is 321956399. The next prime is 321956423. The reversal of 321956421 is 124659123.

It is not a de Polignac number, because 321956421 - 2⁵ = 321956389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321956423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100240 + ... + 103401.

It is an arithmetic number, because the mean of its divisors is an integer number (29324448).

Almost surely, 2^321956421 is an apocalyptic number.

321956421 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

321956421 is a deficient number, since it is larger than the sum of its proper divisors (147234747).

321956421 is a wasteful number, since it uses less digits than its factorization.

321956421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203692.

The product of its digits is 12960, while the sum is 33.

The square root of 321956421 is about 17943.1441224775. The cubic root of 321956421 is about 685.3814778907.

The spelling of 321956421 in words is "three hundred twenty-one million, nine hundred fifty-six thousand, four hundred twenty-one".