20012320021 has 8 divisors (see below), whose sum is σ = 20599050240. Its totient is φ = 19432295568.

The previous prime is 20012319989. The next prime is 20012320037. The reversal of 20012320021 is 12002321002.

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 20012320021 - 2⁵ = 20012319989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20012319983 and 20012320010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012320051) 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, 1670386 + ... + 1682323.

It is an arithmetic number, because the mean of its divisors is an integer number (2574881280).

Almost surely, 2^20012320021 is an apocalyptic number.

It is an amenable number.

20012320021 is a deficient number, since it is larger than the sum of its proper divisors (586730219).

20012320021 is a wasteful number, since it uses less digits than its factorization.

20012320021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3352883.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20012320021 its reverse (12002321002), we get a palindrome (32014641023).

The spelling of 20012320021 in words is "twenty billion, twelve million, three hundred twenty thousand, twenty-one".