221152525 has 12 divisors (see below), whose sum is σ = 299159424. Its totient is φ = 160838000.

The previous prime is 221152523. The next prime is 221152549. The reversal of 221152525 is 525251122.

It is not a de Polignac number, because 221152525 - 2¹ = 221152523 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221152525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221152523) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 401821 + ... + 402370.

It is an arithmetic number, because the mean of its divisors is an integer number (24929952).

Almost surely, 2^221152525 is an apocalyptic number.

221152525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221152525 is a deficient number, since it is larger than the sum of its proper divisors (78006899).

221152525 is a wasteful number, since it uses less digits than its factorization.

221152525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 804212 (or 804207 counting only the distinct ones).

The product of its digits is 2000, while the sum is 25.

The square root of 221152525 is about 14871.1978333959. The cubic root of 221152525 is about 604.7334162352.

The spelling of 221152525 in words is "two hundred twenty-one million, one hundred fifty-two thousand, five hundred twenty-five".