231221326 has 8 divisors (see below), whose sum is σ = 396379440. Its totient is φ = 99094848.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221326 is 623122132.

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

It is a junction number, because it is equal to n+sod(n) for n = 231221297 and 231221306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8257891 + ... + 8257918.

It is an arithmetic number, because the mean of its divisors is an integer number (49547430).

Almost surely, 2^231221326 is an apocalyptic number.

231221326 is a deficient number, since it is larger than the sum of its proper divisors (165158114).

231221326 is a wasteful number, since it uses less digits than its factorization.

231221326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16515818.

The product of its digits is 864, while the sum is 22.

The square root of 231221326 is about 15205.9635012057. The cubic root of 231221326 is about 613.7751425110.

Adding to 231221326 its reverse (623122132), we get a palindrome (854343458).

The spelling of 231221326 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred twenty-six".