221132408 has 32 divisors (see below), whose sum is σ = 474787200. Its totient is φ = 94584672.

The previous prime is 221132399. The next prime is 221132423. The reversal of 221132408 is 804231122.

It is a happy number.

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, 27023 + ... + 34241.

It is an arithmetic number, because the mean of its divisors is an integer number (14837100).

Almost surely, 2^221132408 is an apocalyptic number.

221132408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221132408 is an abundant number, since it is smaller than the sum of its proper divisors (253654792).

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

221132408 is a wasteful number, since it uses less digits than its factorization.

221132408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7779 (or 7775 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 221132408 is about 14870.5214434464. The cubic root of 221132408 is about 604.7150792813.

The spelling of 221132408 in words is "two hundred twenty-one million, one hundred thirty-two thousand, four hundred eight".