221322940 has 12 divisors (see below), whose sum is σ = 464778216. Its totient is φ = 88529168.

The previous prime is 221322901. The next prime is 221322977. The reversal of 221322940 is 49223122.

It is a congruent number.

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, 5533054 + ... + 5533093.

It is an arithmetic number, because the mean of its divisors is an integer number (38731518).

Almost surely, 2^221322940 is an apocalyptic number.

221322940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221322940 is an abundant number, since it is smaller than the sum of its proper divisors (243455276).

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

221322940 is a wasteful number, since it uses less digits than its factorization.

221322940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066156 (or 11066154 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 221322940 is about 14876.9264298779. The cubic root of 221322940 is about 604.8887075298. Note that the first 3 decimals are identical.

The spelling of 221322940 in words is "two hundred twenty-one million, three hundred twenty-two thousand, nine hundred forty".