221964769 has 12 divisors (see below), whose sum is σ = 243952176. Its totient is φ = 201822192.

The previous prime is 221964751. The next prime is 221964773. The reversal of 221964769 is 967469122.

It is not a de Polignac number, because 221964769 - 2⁵ = 221964737 is a prime.

It is a super-2 number, since 2×221964769² = 98536717354446722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221964719) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1522 + ... + 21124.

It is an arithmetic number, because the mean of its divisors is an integer number (20329348).

Almost surely, 2^221964769 is an apocalyptic number.

It is an amenable number.

221964769 is a deficient number, since it is larger than the sum of its proper divisors (21987407).

221964769 is a wasteful number, since it uses less digits than its factorization.

221964769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19696 (or 19683 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 221964769 is about 14898.4821038923. The cubic root of 221964769 is about 605.4728621113.

The spelling of 221964769 in words is "two hundred twenty-one million, nine hundred sixty-four thousand, seven hundred sixty-nine".