20115224321 has 4 divisors (see below), whose sum is σ = 20203837872. Its totient is φ = 20026610772.

The previous prime is 20115224309. The next prime is 20115224369. The reversal of 20115224321 is 12342251102.

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 20115224321 - 2⁶ = 20115224257 is a prime.

It is a super-2 number, since 2×20115224321² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20115224021) 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, 44306435 + ... + 44306888.

It is an arithmetic number, because the mean of its divisors is an integer number (5050959468).

Almost surely, 2^20115224321 is an apocalyptic number.

It is an amenable number.

20115224321 is a deficient number, since it is larger than the sum of its proper divisors (88613551).

20115224321 is an equidigital number, since it uses as much as digits as its factorization.

20115224321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88613550.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20115224321 its reverse (12342251102), we get a palindrome (32457475423).

The spelling of 20115224321 in words is "twenty billion, one hundred fifteen million, two hundred twenty-four thousand, three hundred twenty-one".