221852240 has 20 divisors (see below), whose sum is σ = 515806644. Its totient is φ = 88740864.

The previous prime is 221852221. The next prime is 221852249. The reversal of 221852240 is 42258122.

It can be written as a sum of positive squares in 2 ways, for example, as 123921424 + 97930816 = 11132^2 + 9896^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221852249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1386497 + ... + 1386656.

Almost surely, 2^221852240 is an apocalyptic number.

221852240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221852240 is an abundant number, since it is smaller than the sum of its proper divisors (293954404).

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

221852240 is a wasteful number, since it uses less digits than its factorization.

221852240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773166 (or 2773160 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 221852240 is about 14894.7050994640. The cubic root of 221852240 is about 605.3705263922.

The spelling of 221852240 in words is "two hundred twenty-one million, eight hundred fifty-two thousand, two hundred forty".