221302988 has 12 divisors (see below), whose sum is σ = 387543912. Its totient is φ = 110576160.

The previous prime is 221302979. The next prime is 221302993. The reversal of 221302988 is 889203122.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11945 + ... + 24192.

It is an arithmetic number, because the mean of its divisors is an integer number (32295326).

Almost surely, 2^221302988 is an apocalyptic number.

It is an amenable number.

221302988 is a deficient number, since it is larger than the sum of its proper divisors (166240924).

221302988 is a wasteful number, since it uses less digits than its factorization.

221302988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37672 (or 37670 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 35.

The square root of 221302988 is about 14876.2558461462. The cubic root of 221302988 is about 604.8705303175.

The spelling of 221302988 in words is "two hundred twenty-one million, three hundred two thousand, nine hundred eighty-eight".