20344312121 has 4 divisors (see below), whose sum is σ = 23250642432. Its totient is φ = 17437981812.

The previous prime is 20344312117. The next prime is 20344312141. The reversal of 20344312121 is 12121344302.

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 20344312121 - 2² = 20344312117 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20344312141) 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, 1453165145 + ... + 1453165158.

It is an arithmetic number, because the mean of its divisors is an integer number (5812660608).

Almost surely, 2^20344312121 is an apocalyptic number.

It is an amenable number.

20344312121 is a deficient number, since it is larger than the sum of its proper divisors (2906330311).

20344312121 is an equidigital number, since it uses as much as digits as its factorization.

20344312121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906330310.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 20344312121 its reverse (12121344302), we get a palindrome (32465656423).

The spelling of 20344312121 in words is "twenty billion, three hundred forty-four million, three hundred twelve thousand, one hundred twenty-one".