221408868 has 12 divisors (see below), whose sum is σ = 516620720. Its totient is φ = 73802952.

The previous prime is 221408861. The next prime is 221408909. The reversal of 221408868 is 868804122.

221408868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-5 number, since 5×221408868⁵ (a number of 43 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (221408861) 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, 9225358 + ... + 9225381.

Almost surely, 2^221408868 is an apocalyptic number.

It is an amenable number.

221408868 is an abundant number, since it is smaller than the sum of its proper divisors (295211852).

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

221408868 is a wasteful number, since it uses less digits than its factorization.

221408868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450746 (or 18450744 counting only the distinct ones).

The product of its (nonzero) digits is 49152, while the sum is 39.

The square root of 221408868 is about 14879.8141117421. The cubic root of 221408868 is about 604.9669795060.

The spelling of 221408868 in words is "two hundred twenty-one million, four hundred eight thousand, eight hundred sixty-eight".