221661232 has 40 divisors (see below), whose sum is σ = 489718656. Its totient is φ = 96285696.

The previous prime is 221661169. The next prime is 221661257. The reversal of 221661232 is 232166122.

It is a junction number, because it is equal to n+sod(n) for n = 221661197 and 221661206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27808 + ... + 34879.

Almost surely, 2^221661232 is an apocalyptic number.

It is an amenable number.

221661232 is an abundant number, since it is smaller than the sum of its proper divisors (268057424).

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

221661232 is a wasteful number, since it uses less digits than its factorization.

221661232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62725 (or 62719 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 221661232 is about 14888.2917757545. The cubic root of 221661232 is about 605.1967413327.

The spelling of 221661232 in words is "two hundred twenty-one million, six hundred sixty-one thousand, two hundred thirty-two".