231221320332330 has 16 divisors (see below), whose sum is σ = 554931168797664. Its totient is φ = 61659018755280.

The previous prime is 231221320332323. The next prime is 231221320332371. The reversal of 231221320332330 is 33233023122132.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 7707377344411 = 231221320332330 / (2 + 3 + 1 + 2 + 2 + 1 + 3 + 2 + 0 + 3 + 3 + 2 + 3 + 3 + 0).

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, 3853688672176 + ... + 3853688672235.

It is an arithmetic number, because the mean of its divisors is an integer number (34683198049854).

Almost surely, 2^{231221320332330} is an apocalyptic number.

231221320332330 is an abundant number, since it is smaller than the sum of its proper divisors (323709848465334).

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

231221320332330 is a wasteful number, since it uses less digits than its factorization.

231221320332330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7707377344421.

The product of its (nonzero) digits is 23328, while the sum is 30.

Adding to 231221320332330 its reverse (33233023122132), we get a palindrome (264454343454462).

The spelling of 231221320332330 in words is "two hundred thirty-one trillion, two hundred twenty-one billion, three hundred twenty million, three hundred thirty-two thousand, three hundred thirty".