221823740 has 12 divisors (see below), whose sum is σ = 465829896. Its totient is φ = 88729488.

The previous prime is 221823731. The next prime is 221823751. The reversal of 221823740 is 47328122.

221823740 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 3 ways as a sum of consecutive naturals, for example, 5545574 + ... + 5545613.

It is an arithmetic number, because the mean of its divisors is an integer number (38819158).

Almost surely, 2^221823740 is an apocalyptic number.

221823740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221823740 is an abundant number, since it is smaller than the sum of its proper divisors (244006156).

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

221823740 is a wasteful number, since it uses less digits than its factorization.

221823740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11091196 (or 11091194 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 221823740 is about 14893.7483529164. The cubic root of 221823740 is about 605.3446025328.

The spelling of 221823740 in words is "two hundred twenty-one million, eight hundred twenty-three thousand, seven hundred forty".