221231394 has 48 divisors (see below), whose sum is σ = 487875960. Its totient is φ = 72441600.

The previous prime is 221231393. The next prime is 221231429. The reversal of 221231394 is 493132122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 220968225 + 263169 = 14865^2 + 513^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221231393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 315244 + ... + 315944.

Almost surely, 2^221231394 is an apocalyptic number.

221231394 is an abundant number, since it is smaller than the sum of its proper divisors (266644566).

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

221231394 is a wasteful number, since it uses less digits than its factorization.

221231394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995 (or 992 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 221231394 is about 14873.8493336459. The cubic root of 221231394 is about 604.8052958143.

The spelling of 221231394 in words is "two hundred twenty-one million, two hundred thirty-one thousand, three hundred ninety-four".