221310990 has 24 divisors (see below), whose sum is σ = 575408808. Its totient is φ = 59016240.

The previous prime is 221310911. The next prime is 221311003. The reversal of 221310990 is 99013122.

221310990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1229416 + ... + 1229595.

It is an arithmetic number, because the mean of its divisors is an integer number (23975367).

Almost surely, 2^221310990 is an apocalyptic number.

221310990 is an abundant number, since it is smaller than the sum of its proper divisors (354097818).

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

221310990 is a wasteful number, since it uses less digits than its factorization.

221310990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2459024 (or 2459021 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 221310990 is about 14876.5247957982. The cubic root of 221310990 is about 604.8778206478.

It can be divided in two parts, 2213 and 10990, that added together give a triangular number (13203 = T₁₆₂).

The spelling of 221310990 in words is "two hundred twenty-one million, three hundred ten thousand, nine hundred ninety".