231221082 has 8 divisors (see below), whose sum is σ = 462442176. Its totient is φ = 77073692.

The previous prime is 231221077. The next prime is 231221083. The reversal of 231221082 is 280122132.

It is a happy number.

231221082 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

231221082 is an admirable number.

It is a super-2 number, since 2×231221082² = 106926377522501448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231221083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19268418 + ... + 19268429.

It is an arithmetic number, because the mean of its divisors is an integer number (57805272).

Almost surely, 2^231221082 is an apocalyptic number.

231221082 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

231221082 is a wasteful number, since it uses less digits than its factorization.

231221082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38536852.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 231221082 is about 15205.9554780356. The cubic root of 231221082 is about 613.7749266122.

The spelling of 231221082 in words is "two hundred thirty-one million, two hundred twenty-one thousand, eighty-two".