221525142 has 64 divisors (see below), whose sum is σ = 495763200. Its totient is φ = 65681280.

The previous prime is 221525131. The next prime is 221525153. The reversal of 221525142 is 241525122.

It is an interprime number because it is at equal distance from previous prime (221525131) and next prime (221525153).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121417 + ... + 123227.

It is an arithmetic number, because the mean of its divisors is an integer number (7746300).

Almost surely, 2^221525142 is an apocalyptic number.

221525142 is an abundant number, since it is smaller than the sum of its proper divisors (274238058).

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

221525142 is a wasteful number, since it uses less digits than its factorization.

221525142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1901.

The product of its digits is 1600, while the sum is 24.

The square root of 221525142 is about 14883.7207041788. The cubic root of 221525142 is about 605.0728614750.

The spelling of 221525142 in words is "two hundred twenty-one million, five hundred twenty-five thousand, one hundred forty-two".