231221334 has 16 divisors (see below), whose sum is σ = 464841072. Its totient is φ = 76674048.

The previous prime is 231221299. The next prime is 231221381. The reversal of 231221334 is 433122132.

It is a self number, because there is not a number n which added to its sum of digits gives 231221334.

It is a congruent number.

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, 98679 + ... + 100994.

It is an arithmetic number, because the mean of its divisors is an integer number (29052567).

Almost surely, 2^231221334 is an apocalyptic number.

231221334 is an abundant number, since it is smaller than the sum of its proper divisors (233619738).

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

231221334 is a wasteful number, since it uses less digits than its factorization.

231221334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199871.

The product of its digits is 864, while the sum is 21.

The square root of 231221334 is about 15205.9637642604. The cubic root of 231221334 is about 613.7751495896.

Adding to 231221334 its reverse (433122132), we get a palindrome (664343466).

The spelling of 231221334 in words is "two hundred thirty-one million, two hundred twenty-one thousand, three hundred thirty-four".