2221501543 has 4 divisors (see below), whose sum is σ = 2223334168. Its totient is φ = 2219668920.

The previous prime is 2221501531. The next prime is 2221501549. The reversal of 2221501543 is 3451051222.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2221501543 - 2²¹ = 2219404391 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 (2221501549) 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, 914493 + ... + 916918.

It is an arithmetic number, because the mean of its divisors is an integer number (555833542).

Almost surely, 2^2221501543 is an apocalyptic number.

2221501543 is a deficient number, since it is larger than the sum of its proper divisors (1832625).

2221501543 is a wasteful number, since it uses less digits than its factorization.

2221501543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832624.

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

The square root of 2221501543 is about 47132.8075017816. The cubic root of 2221501543 is about 1304.8147969488.

Adding to 2221501543 its reverse (3451051222), we get a palindrome (5672552765).

The spelling of 2221501543 in words is "two billion, two hundred twenty-one million, five hundred one thousand, five hundred forty-three".