221430888 has 64 divisors (see below), whose sum is σ = 702960000. Its totient is φ = 63265536.

The previous prime is 221430887. The next prime is 221430947. The reversal of 221430888 is 888034122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 6.

It is not an unprimeable number, because it can be changed into a prime (221430887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71713 + ... + 74736.

It is an arithmetic number, because the mean of its divisors is an integer number (10983750).

Almost surely, 2^221430888 is an apocalyptic number.

221430888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221430888 is an abundant number, since it is smaller than the sum of its proper divisors (481529112).

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

221430888 is a wasteful number, since it uses less digits than its factorization.

221430888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146471 (or 146461 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 221430888 is about 14880.5540219442. The cubic root of 221430888 is about 604.9870343054.

The spelling of 221430888 in words is "two hundred twenty-one million, four hundred thirty thousand, eight hundred eighty-eight".