221385776 has 10 divisors (see below), whose sum is σ = 428934972. Its totient is φ = 110692880.

The previous prime is 221385767. The next prime is 221385779. The reversal of 221385776 is 677583122.

221385776 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221385779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6918290 + ... + 6918321.

Almost surely, 2^221385776 is an apocalyptic number.

It is an amenable number.

221385776 is a deficient number, since it is larger than the sum of its proper divisors (207549196).

221385776 is a wasteful number, since it uses less digits than its factorization.

221385776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13836619 (or 13836613 counting only the distinct ones).

The product of its digits is 141120, while the sum is 41.

The square root of 221385776 is about 14879.0381409552. The cubic root of 221385776 is about 604.9459469501.

The spelling of 221385776 in words is "two hundred twenty-one million, three hundred eighty-five thousand, seven hundred seventy-six".