20013120021 has 8 divisors (see below), whose sum is σ = 26684899200. Its totient is φ = 13341710432.

The previous prime is 20013120011. The next prime is 20013120031. The reversal of 20013120021 is 12002131002.

It is an interprime number because it is at equal distance from previous prime (20013120011) and next prime (20013120031).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20013120021 - 2⁵ = 20013119989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20013119979 and 20013120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20013120011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79801 + ... + 215393.

It is an arithmetic number, because the mean of its divisors is an integer number (3335612400).

Almost surely, 2^20013120021 is an apocalyptic number.

It is an amenable number.

20013120021 is a deficient number, since it is larger than the sum of its proper divisors (6671779179).

20013120021 is a wasteful number, since it uses less digits than its factorization.

20013120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184795.

The product of its (nonzero) digits is 24, while the sum is 12.

Adding to 20013120021 its reverse (12002131002), we get a palindrome (32015251023).

The spelling of 20013120021 in words is "twenty billion, thirteen million, one hundred twenty thousand, twenty-one".