20413120021 has 4 divisors (see below), whose sum is σ = 23329280032. Its totient is φ = 17496960012.

The previous prime is 20413120009. The next prime is 20413120069. The reversal of 20413120021 is 12002131402.

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 not a de Polignac number, because 20413120021 - 2⁵ = 20413119989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20413119977 and 20413120004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20413120001) 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, 1458079995 + ... + 1458080008.

It is an arithmetic number, because the mean of its divisors is an integer number (5832320008).

Almost surely, 2^20413120021 is an apocalyptic number.

It is an amenable number.

20413120021 is a deficient number, since it is larger than the sum of its proper divisors (2916160011).

20413120021 is an equidigital number, since it uses as much as digits as its factorization.

20413120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2916160010.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20413120021 its reverse (12002131402), we get a palindrome (32415251423).

The spelling of 20413120021 in words is "twenty billion, four hundred thirteen million, one hundred twenty thousand, twenty-one".