221969232 has 30 divisors (see below), whose sum is σ = 621205962. Its totient is φ = 73989696.

The previous prime is 221969213. The next prime is 221969233. The reversal of 221969232 is 232969122.

It can be written as a sum of positive squares in only one way, i.e., 179667216 + 42302016 = 13404^2 + 6504^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221969233) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 770583 + ... + 770870.

Almost surely, 2^221969232 is an apocalyptic number.

It is an amenable number.

221969232 is an abundant number, since it is smaller than the sum of its proper divisors (399236730).

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

221969232 is a wasteful number, since it uses less digits than its factorization.

221969232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1541467 (or 1541458 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 221969232 is about 14898.6318834986. The cubic root of 221969232 is about 605.4769201236.

The spelling of 221969232 in words is "two hundred twenty-one million, nine hundred sixty-nine thousand, two hundred thirty-two".