221933420 has 12 divisors (see below), whose sum is σ = 466060224. Its totient is φ = 88773360.

The previous prime is 221933401. The next prime is 221933423. The reversal of 221933420 is 24339122.

It is a self number, because there is not a number n which added to its sum of digits gives 221933420.

It is not an unprimeable number, because it can be changed into a prime (221933423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5548316 + ... + 5548355.

It is an arithmetic number, because the mean of its divisors is an integer number (38838352).

Almost surely, 2^221933420 is an apocalyptic number.

221933420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221933420 is an abundant number, since it is smaller than the sum of its proper divisors (244126804).

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

221933420 is a wasteful number, since it uses less digits than its factorization.

221933420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11096680 (or 11096678 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 221933420 is about 14897.4299796978. The cubic root of 221933420 is about 605.4443562926. Note that the first 3 decimals are identical.

The spelling of 221933420 in words is "two hundred twenty-one million, nine hundred thirty-three thousand, four hundred twenty".