221464432 has 20 divisors (see below), whose sum is σ = 490385776. Its totient is φ = 94913280.

The previous prime is 221464421. The next prime is 221464433. The reversal of 221464432 is 234464122.

221464432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 221464432.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221464433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988569 + ... + 988792.

Almost surely, 2^221464432 is an apocalyptic number.

It is an amenable number.

221464432 is an abundant number, since it is smaller than the sum of its proper divisors (268921344).

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

221464432 is a wasteful number, since it uses less digits than its factorization.

221464432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977376 (or 1977370 counting only the distinct ones).

The product of its digits is 9216, while the sum is 28.

The square root of 221464432 is about 14881.6810878341. The cubic root of 221464432 is about 605.0175820767.

The spelling of 221464432 in words is "two hundred twenty-one million, four hundred sixty-four thousand, four hundred thirty-two".