231221133130 has 32 divisors (see below), whose sum is σ = 462671774208. Its totient is φ = 82619956800.

The previous prime is 231221133113. The next prime is 231221133131. The reversal of 231221133130 is 31331122132.

It is not an unprimeable number, because it can be changed into a prime (231221133131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28683456 + ... + 28691515.

It is an arithmetic number, because the mean of its divisors is an integer number (14458492944).

Almost surely, 2^231221133130 is an apocalyptic number.

231221133130 is an abundant number, since it is smaller than the sum of its proper divisors (231450641078).

231221133130 is a wasteful number, since it uses less digits than its factorization.

231221133130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57375022.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 231221133130 its reverse (31331122132), we get a palindrome (262552255262).

The spelling of 231221133130 in words is "two hundred thirty-one billion, two hundred twenty-one million, one hundred thirty-three thousand, one hundred thirty".