20440430121 has 4 divisors (see below), whose sum is σ = 27253906832. Its totient is φ = 13626953412.

The previous prime is 20440430107. The next prime is 20440430161. The reversal of 20440430121 is 12103404402.

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 not a de Polignac number, because 20440430121 - 2⁵ = 20440430089 is a prime.

It is a super-2 number, since 2×20440430121² (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 (20440430161) 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, 3406738351 + ... + 3406738356.

It is an arithmetic number, because the mean of its divisors is an integer number (6813476708).

Almost surely, 2^20440430121 is an apocalyptic number.

It is an amenable number.

20440430121 is a deficient number, since it is larger than the sum of its proper divisors (6813476711).

20440430121 is an equidigital number, since it uses as much as digits as its factorization.

20440430121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6813476710.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20440430121 its reverse (12103404402), we get a palindrome (32543834523).

The spelling of 20440430121 in words is "twenty billion, four hundred forty million, four hundred thirty thousand, one hundred twenty-one".