221254530 has 32 divisors (see below), whose sum is σ = 606870144. Its totient is φ = 50572416.

The previous prime is 221254477. The next prime is 221254559. The reversal of 221254530 is 35452122.

It is a self number, because there is not a number n which added to its sum of digits gives 221254530.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 526587 + ... + 527006.

It is an arithmetic number, because the mean of its divisors is an integer number (18964692).

Almost surely, 2^221254530 is an apocalyptic number.

221254530 is an abundant number, since it is smaller than the sum of its proper divisors (385615614).

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

221254530 is a wasteful number, since it uses less digits than its factorization.

221254530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053610.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 221254530 is about 14874.6270541483. The cubic root of 221254530 is about 604.8263782464.

The spelling of 221254530 in words is "two hundred twenty-one million, two hundred fifty-four thousand, five hundred thirty".