321020431 has 4 divisors (see below), whose sum is σ = 321257664. Its totient is φ = 320783200.

The previous prime is 321020363. The next prime is 321020489. The reversal of 321020431 is 134020123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 321020431 - 2⁷ = 321020303 is a prime.

It is a super-2 number, since 2×321020431² = 206108234238851522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321023431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116575 + ... + 119296.

It is an arithmetic number, because the mean of its divisors is an integer number (80314416).

Almost surely, 2^321020431 is an apocalyptic number.

321020431 is a deficient number, since it is larger than the sum of its proper divisors (237233).

321020431 is a wasteful number, since it uses less digits than its factorization.

321020431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237232.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 321020431 is about 17917.0430317059. The cubic root of 321020431 is about 684.7166540837.

Adding to 321020431 its reverse (134020123), we get a palindrome (455040554).

The spelling of 321020431 in words is "three hundred twenty-one million, twenty thousand, four hundred thirty-one".