20403333121 has 4 divisors (see below), whose sum is σ = 20403756244. Its totient is φ = 20402910000.

The previous prime is 20403333109. The next prime is 20403333133. The reversal of 20403333121 is 12133330402.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20403333109) and next prime (20403333133).

It can be written as a sum of positive squares in 2 ways, for example, as 13759290000 + 6644043121 = 117300^2 + 81511^2 .

It is a cyclic number.

It is not a de Polignac number, because 20403333121 - 2⁵ = 20403333089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20403333092 and 20403333101.

It is not an unprimeable number, because it can be changed into a prime (20403333151) 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, 128310 + ... + 239311.

It is an arithmetic number, because the mean of its divisors is an integer number (5100939061).

Almost surely, 2^20403333121 is an apocalyptic number.

It is an amenable number.

20403333121 is a deficient number, since it is larger than the sum of its proper divisors (423123).

20403333121 is an equidigital number, since it uses as much as digits as its factorization.

20403333121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423122.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20403333121 its reverse (12133330402), we get a palindrome (32536663523).

The spelling of 20403333121 in words is "twenty billion, four hundred three million, three hundred thirty-three thousand, one hundred twenty-one".