20015242421 has 8 divisors (see below), whose sum is σ = 20275555200. Its totient is φ = 19755103680.

The previous prime is 20015242397. The next prime is 20015242453. The reversal of 20015242421 is 12424251002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20015242421 - 2²² = 20011048117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20015242921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196541 + ... + 280461.

It is an arithmetic number, because the mean of its divisors is an integer number (2534444400).

Almost surely, 2^20015242421 is an apocalyptic number.

It is an amenable number.

20015242421 is a deficient number, since it is larger than the sum of its proper divisors (260312779).

20015242421 is an equidigital number, since it uses as much as digits as its factorization.

20015242421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87019.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 20015242421 its reverse (12424251002), we get a palindrome (32439493423).

The spelling of 20015242421 in words is "twenty billion, fifteen million, two hundred forty-two thousand, four hundred twenty-one".