20411233121 has 4 divisors (see below), whose sum is σ = 20453145792. Its totient is φ = 20369320452.

The previous prime is 20411233103. The next prime is 20411233169. The reversal of 20411233121 is 12133211402.

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 20411233121 - 2³⁴ = 3231363937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20411233093 and 20411233102.

It is not an unprimeable number, because it can be changed into a prime (20411233181) 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, 20955605 + ... + 20956578.

It is an arithmetic number, because the mean of its divisors is an integer number (5113286448).

Almost surely, 2^20411233121 is an apocalyptic number.

It is an amenable number.

20411233121 is a deficient number, since it is larger than the sum of its proper divisors (41912671).

20411233121 is an equidigital number, since it uses as much as digits as its factorization.

20411233121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41912670.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 20411233121 its reverse (12133211402), we get a palindrome (32544444523).

The spelling of 20411233121 in words is "twenty billion, four hundred eleven million, two hundred thirty-three thousand, one hundred twenty-one".