2221525541 has 16 divisors (see below), whose sum is σ = 2539123200. Its totient is φ = 1930967808.

The previous prime is 2221525531. The next prime is 2221525573. The reversal of 2221525541 is 1455251222.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2221525541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221525531) 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 15 ways as a sum of consecutive naturals, for example, 86621 + ... + 109298.

It is an arithmetic number, because the mean of its divisors is an integer number (158695200).

Almost surely, 2^2221525541 is an apocalyptic number.

It is an amenable number.

2221525541 is a deficient number, since it is larger than the sum of its proper divisors (317597659).

2221525541 is a wasteful number, since it uses less digits than its factorization.

2221525541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195988.

The product of its digits is 8000, while the sum is 29.

The square root of 2221525541 is about 47133.0620796061. The cubic root of 2221525541 is about 1304.8194953974.

Adding to 2221525541 its reverse (1455251222), we get a palindrome (3676776763).

The spelling of 2221525541 in words is "two billion, two hundred twenty-one million, five hundred twenty-five thousand, five hundred forty-one".