20133133121 has 4 divisors (see below), whose sum is σ = 20677271892. Its totient is φ = 19588994352.

The previous prime is 20133133093. The next prime is 20133133129. The reversal of 20133133121 is 12133133102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12133133102 = 2 ⋅6066566551.

It can be written as a sum of positive squares in 2 ways, for example, as 18896626225 + 1236506896 = 137465^2 + 35164^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133133121 - 2¹⁸ = 20132870977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20133133093 and 20133133102.

It is not an unprimeable number, because it can be changed into a prime (20133133129) 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, 272069330 + ... + 272069403.

It is an arithmetic number, because the mean of its divisors is an integer number (5169317973).

Almost surely, 2^20133133121 is an apocalyptic number.

It is an amenable number.

20133133121 is a deficient number, since it is larger than the sum of its proper divisors (544138771).

20133133121 is an equidigital number, since it uses as much as digits as its factorization.

20133133121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544138770.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 20133133121 its reverse (12133133102), we get a palindrome (32266266223).

The spelling of 20133133121 in words is "twenty billion, one hundred thirty-three million, one hundred thirty-three thousand, one hundred twenty-one".