20435335121 has 4 divisors (see below), whose sum is σ = 20509109172. Its totient is φ = 20361561072.

The previous prime is 20435335111. The next prime is 20435335127. The reversal of 20435335121 is 12153353402.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3368525521 + 17066809600 = 58039^2 + 130640^2 .

It is a cyclic number.

It is not a de Polignac number, because 20435335121 - 2²⁶ = 20368226257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20435335127) 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, 36886610 + ... + 36887163.

It is an arithmetic number, because the mean of its divisors is an integer number (5127277293).

Almost surely, 2^20435335121 is an apocalyptic number.

It is an amenable number.

20435335121 is a deficient number, since it is larger than the sum of its proper divisors (73774051).

20435335121 is an equidigital number, since it uses as much as digits as its factorization.

20435335121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73774050.

The product of its (nonzero) digits is 10800, while the sum is 29.

Adding to 20435335121 its reverse (12153353402), we get a palindrome (32588688523).

The spelling of 20435335121 in words is "twenty billion, four hundred thirty-five million, three hundred thirty-five thousand, one hundred twenty-one".