221554040 has 32 divisors (see below), whose sum is σ = 502433280. Its totient is φ = 87921792.

The previous prime is 221554033. The next prime is 221554087. The reversal of 221554040 is 40455122.

It is a happy number.

221554040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221553997 and 221554015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16727 + ... + 26886.

It is an arithmetic number, because the mean of its divisors is an integer number (15701040).

Almost surely, 2^221554040 is an apocalyptic number.

221554040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221554040 is an abundant number, since it is smaller than the sum of its proper divisors (280879240).

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

221554040 is a wasteful number, since it uses less digits than its factorization.

221554040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43751 (or 43747 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 221554040 is about 14884.6914647231. The cubic root of 221554040 is about 605.0991709571.

The spelling of 221554040 in words is "two hundred twenty-one million, five hundred fifty-four thousand, forty".