221199940 has 48 divisors (see below), whose sum is σ = 501399360. Its totient is φ = 81486720.

The previous prime is 221199893. The next prime is 221199941. The reversal of 221199940 is 49991122.

It is a self number, because there is not a number n which added to its sum of digits gives 221199940.

It is not an unprimeable number, because it can be changed into a prime (221199941) 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, 170695 + ... + 171985.

It is an arithmetic number, because the mean of its divisors is an integer number (10445820).

Almost surely, 2^221199940 is an apocalyptic number.

221199940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221199940 is an abundant number, since it is smaller than the sum of its proper divisors (280199420).

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

221199940 is a wasteful number, since it uses less digits than its factorization.

221199940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1972 (or 1970 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 221199940 is about 14872.7919369566. The cubic root of 221199940 is about 604.7766313361.

The spelling of 221199940 in words is "two hundred twenty-one million, one hundred ninety-nine thousand, nine hundred forty".