21804143015 has 16 divisors (see below), whose sum is σ = 26271954720. Its totient is φ = 17372060160.

The previous prime is 21804142961. The next prime is 21804143017. The reversal of 21804143015 is 51034140812.

It is not a de Polignac number, because 21804143015 - 2⁶ = 21804142951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21804143017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4168832 + ... + 4174058.

It is an arithmetic number, because the mean of its divisors is an integer number (1641997170).

Almost surely, 2^21804143015 is an apocalyptic number.

21804143015 is a deficient number, since it is larger than the sum of its proper divisors (4467811705).

21804143015 is a wasteful number, since it uses less digits than its factorization.

21804143015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8482.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 21804143015 its reverse (51034140812), we get a palindrome (72838283827).

The spelling of 21804143015 in words is "twenty-one billion, eight hundred four million, one hundred forty-three thousand, fifteen".