221425541 has 4 divisors (see below), whose sum is σ = 221488800. Its totient is φ = 221362284.

The previous prime is 221425517. The next prime is 221425549. The reversal of 221425541 is 145524122.

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.

It is a cyclic number.

It is not a de Polignac number, because 221425541 - 2¹⁴ = 221409157 is a prime.

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 221425541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221425549) 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, 26051 + ... + 33488.

It is an arithmetic number, because the mean of its divisors is an integer number (55372200).

Almost surely, 2^221425541 is an apocalyptic number.

It is an amenable number.

221425541 is a deficient number, since it is larger than the sum of its proper divisors (63259).

221425541 is an equidigital number, since it uses as much as digits as its factorization.

221425541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63258.

The product of its digits is 3200, while the sum is 26.

The square root of 221425541 is about 14880.3743568500. The cubic root of 221425541 is about 604.9821646269.

Adding to 221425541 its reverse (145524122), we get a palindrome (366949663).

The spelling of 221425541 in words is "two hundred twenty-one million, four hundred twenty-five thousand, five hundred forty-one".