221541925 has 18 divisors (see below), whose sum is σ = 301960274. Its totient is φ = 161119200.

The previous prime is 221541923. The next prime is 221541959. The reversal of 221541925 is 529145122.

221541925 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 12623809 + 208918116 = 3553^2 + 14454^2 .

It is not a de Polignac number, because 221541925 - 2¹ = 221541923 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221541923) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 33594 + ... + 39643.

Almost surely, 2^221541925 is an apocalyptic number.

221541925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

221541925 is a deficient number, since it is larger than the sum of its proper divisors (80418349).

221541925 is a wasteful number, since it uses less digits than its factorization.

221541925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73269 (or 73253 counting only the distinct ones).

The product of its digits is 7200, while the sum is 31.

The square root of 221541925 is about 14884.2844974154. The cubic root of 221541925 is about 605.0881414282.

The spelling of 221541925 in words is "two hundred twenty-one million, five hundred forty-one thousand, nine hundred twenty-five".