231220113311 has 8 divisors (see below), whose sum is σ = 252284764800. Its totient is φ = 210162902040.

The previous prime is 231220113301. The next prime is 231220113337. The reversal of 231220113311 is 113311022132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231220113311 - 2⁶ = 231220113247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220113301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1794971 + ... + 1919468.

It is an arithmetic number, because the mean of its divisors is an integer number (31535595600).

Almost surely, 2^231220113311 is an apocalyptic number.

231220113311 is a deficient number, since it is larger than the sum of its proper divisors (21064651489).

231220113311 is a wasteful number, since it uses less digits than its factorization.

231220113311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3720109.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 231220113311 its reverse (113311022132), we get a palindrome (344531135443).

The spelling of 231220113311 in words is "two hundred thirty-one billion, two hundred twenty million, one hundred thirteen thousand, three hundred eleven".