221477385 has 8 divisors (see below), whose sum is σ = 354363840. Its totient is φ = 118121264.

The previous prime is 221477359. The next prime is 221477387. The reversal of 221477385 is 583774122.

221477385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221477385 - 2⁵ = 221477353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221477387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7382565 + ... + 7382594.

It is an arithmetic number, because the mean of its divisors is an integer number (44295480).

Almost surely, 2^221477385 is an apocalyptic number.

It is an amenable number.

221477385 is a deficient number, since it is larger than the sum of its proper divisors (132886455).

221477385 is a wasteful number, since it uses less digits than its factorization.

221477385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14765167.

The product of its digits is 94080, while the sum is 39.

The square root of 221477385 is about 14882.1162809595. The cubic root of 221477385 is about 605.0293772589.

The spelling of 221477385 in words is "two hundred twenty-one million, four hundred seventy-seven thousand, three hundred eighty-five".