231021320 has 32 divisors (see below), whose sum is σ = 520781400. Its totient is φ = 92233728.

The previous prime is 231021317. The next prime is 231021353. The reversal of 231021320 is 23120132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 71605444 + 159415876 = 8462^2 + 12626^2 .

It is a junction number, because it is equal to n+sod(n) for n = 231021295 and 231021304.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17096 + ... + 27464.

Almost surely, 2^231021320 is an apocalyptic number.

231021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231021320 is an abundant number, since it is smaller than the sum of its proper divisors (289760080).

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

231021320 is a wasteful number, since it uses less digits than its factorization.

231021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10937 (or 10933 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231021320 is about 15199.3855138950. The cubic root of 231021320 is about 613.5981200225.

Adding to 231021320 its reverse (23120132), we get a palindrome (254141452).

It can be divided in two parts, 231021 and 320, that multiplied together give a triangular number (73926720 = T₁₂₁₅₉).

The spelling of 231021320 in words is "two hundred thirty-one million, twenty-one thousand, three hundred twenty".