231321400 has 48 divisors (see below), whose sum is σ = 556381800. Its totient is φ = 89335680.

The previous prime is 231321383. The next prime is 231321407. The reversal of 231321400 is 4123132.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14142 + ... + 25741.

Almost surely, 2^231321400 is an apocalyptic number.

231321400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231321400 is an abundant number, since it is smaller than the sum of its proper divisors (325060400).

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

231321400 is a wasteful number, since it uses less digits than its factorization.

231321400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39928 (or 39919 counting only the distinct ones).

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

The square root of 231321400 is about 15209.2537621015. The cubic root of 231321400 is about 613.8636782809.

Adding to 231321400 its reverse (4123132), we get a palindrome (235444532).

The spelling of 231321400 in words is "two hundred thirty-one million, three hundred twenty-one thousand, four hundred".