231221319 has 16 divisors (see below), whose sum is σ = 352750080. Its totient is φ = 131971680.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221319 is 913122132.

It is not a de Polignac number, because 231221319 - 2¹¹ = 231219271 is a prime.

It is a super-2 number, since 2×231221319² = 106926596720199522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221119) 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, 13309 + ... + 25289.

It is an arithmetic number, because the mean of its divisors is an integer number (22046880).

Almost surely, 2^231221319 is an apocalyptic number.

231221319 is a deficient number, since it is larger than the sum of its proper divisors (121528761).

231221319 is a wasteful number, since it uses less digits than its factorization.

231221319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12910.

The product of its digits is 648, while the sum is 24.

The square root of 231221319 is about 15205.9632710328. The cubic root of 231221319 is about 613.7751363172.

It can be divided in two parts, 231221 and 319, that added together give a triangular number (231540 = T₆₈₀).

The spelling of 231221319 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred nineteen".