221525430 has 64 divisors (see below), whose sum is σ = 611573760. Its totient is φ = 50304384.

The previous prime is 221525393. The next prime is 221525497. The reversal of 221525430 is 34525122.

It is a super-2 number, since 2×221525430² = 98147032273369800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221525430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29611 + ... + 36329.

It is an arithmetic number, because the mean of its divisors is an integer number (9555840).

Almost surely, 2^221525430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221525430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (305786880).

221525430 is an abundant number, since it is smaller than the sum of its proper divisors (390048330).

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

221525430 is a wasteful number, since it uses less digits than its factorization.

221525430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6893.

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

The square root of 221525430 is about 14883.7303791758. The cubic root of 221525430 is about 605.0731236889.

The spelling of 221525430 in words is "two hundred twenty-one million, five hundred twenty-five thousand, four hundred thirty".