221228524 has 48 divisors (see below), whose sum is σ = 443520000. Its totient is φ = 95630400.

The previous prime is 221228521. The next prime is 221228549. The reversal of 221228524 is 425822122.

It is a junction number, because it is equal to n+sod(n) for n = 221228492 and 221228501.

It is not an unprimeable number, because it can be changed into a prime (221228521) 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, 79102 + ... + 81850.

It is an arithmetic number, because the mean of its divisors is an integer number (9240000).

Almost surely, 2^221228524 is an apocalyptic number.

It is an amenable number.

221228524 is an abundant number, since it is smaller than the sum of its proper divisors (222291476).

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

221228524 is a wasteful number, since it uses less digits than its factorization.

221228524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2854 (or 2852 counting only the distinct ones).

The product of its digits is 5120, while the sum is 28.

The square root of 221228524 is about 14873.7528552817. The cubic root of 221228524 is about 604.8026804550.

The spelling of 221228524 in words is "two hundred twenty-one million, two hundred twenty-eight thousand, five hundred twenty-four".