221525413 has 4 divisors (see below), whose sum is σ = 221558688. Its totient is φ = 221492140.

The previous prime is 221525393. The next prime is 221525497. The reversal of 221525413 is 314525122.

221525413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 314525122 = 2 ⋅157262561.

It is a cyclic number.

It is not a de Polignac number, because 221525413 - 2¹³ = 221517221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221525813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2833 + ... + 21238.

It is an arithmetic number, because the mean of its divisors is an integer number (55389672).

Almost surely, 2^221525413 is an apocalyptic number.

It is an amenable number.

221525413 is a deficient number, since it is larger than the sum of its proper divisors (33275).

221525413 is an equidigital number, since it uses as much as digits as its factorization.

221525413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33274.

The product of its digits is 2400, while the sum is 25.

The square root of 221525413 is about 14883.7298080824. The cubic root of 221525413 is about 605.0731082110.

The spelling of 221525413 in words is "two hundred twenty-one million, five hundred twenty-five thousand, four hundred thirteen".