221272525 has 12 divisors (see below), whose sum is σ = 278475232. Its totient is φ = 174374640.

The previous prime is 221272511. The next prime is 221272547. The reversal of 221272525 is 525272122.

221272525 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221272525 - 2⁹ = 221272013 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221272493 and 221272502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64377 + ... + 67726.

Almost surely, 2^221272525 is an apocalyptic number.

221272525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221272525 is a deficient number, since it is larger than the sum of its proper divisors (57202707).

221272525 is a wasteful number, since it uses less digits than its factorization.

221272525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132180 (or 132175 counting only the distinct ones).

The product of its digits is 5600, while the sum is 28.

The square root of 221272525 is about 14875.2319309650. The cubic root of 221272525 is about 604.8427749813.

The spelling of 221272525 in words is "two hundred twenty-one million, two hundred seventy-two thousand, five hundred twenty-five".