20413240121 has 4 divisors (see below), whose sum is σ = 21487621200. Its totient is φ = 19338859044.

The previous prime is 20413240109. The next prime is 20413240123. The reversal of 20413240121 is 12104231402.

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 20413240121 - 2¹⁰ = 20413239097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20413240093 and 20413240102.

It is not an unprimeable number, because it can be changed into a prime (20413240123) 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, 537190511 + ... + 537190548.

It is an arithmetic number, because the mean of its divisors is an integer number (5371905300).

Almost surely, 2^20413240121 is an apocalyptic number.

It is an amenable number.

20413240121 is a deficient number, since it is larger than the sum of its proper divisors (1074381079).

20413240121 is a wasteful number, since it uses less digits than its factorization.

20413240121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074381078.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20413240121 its reverse (12104231402), we get a palindrome (32517471523).

The spelling of 20413240121 in words is "twenty billion, four hundred thirteen million, two hundred forty thousand, one hundred twenty-one".