221253632 has 52 divisors (see below), whose sum is σ = 465904080. Its totient is φ = 104767488.

The previous prime is 221253611. The next prime is 221253653. The reversal of 221253632 is 236352122.

It is an interprime number because it is at equal distance from previous prime (221253611) and next prime (221253653).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76403 + ... + 79245.

Almost surely, 2^221253632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221253632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232952040).

221253632 is an abundant number, since it is smaller than the sum of its proper divisors (244650448).

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

221253632 is an equidigital number, since it uses as much as digits as its factorization.

221253632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886 (or 2864 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 221253632 is about 14874.5968684869. The cubic root of 221253632 is about 604.8255599810.

The spelling of 221253632 in words is "two hundred twenty-one million, two hundred fifty-three thousand, six hundred thirty-two".