231021330 has 32 divisors (see below), whose sum is σ = 587067264. Its totient is φ = 57981696.

The previous prime is 231021317. The next prime is 231021353. The reversal of 231021330 is 33120132.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225982 + ... + 227001.

It is an arithmetic number, because the mean of its divisors is an integer number (18345852).

Almost surely, 2^231021330 is an apocalyptic number.

231021330 is an abundant number, since it is smaller than the sum of its proper divisors (356045934).

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

231021330 is a wasteful number, since it uses less digits than its factorization.

231021330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453010.

The product of its (nonzero) digits is 108, while the sum is 15.

The square root of 231021330 is about 15199.3858428556. The cubic root of 231021330 is about 613.5981288760.

Adding to 231021330 its reverse (33120132), we get a palindrome (264141462).

The spelling of 231021330 in words is "two hundred thirty-one million, twenty-one thousand, three hundred thirty".