20013721264331 has 4 divisors (see below), whose sum is σ = 20166497762664. Its totient is φ = 19860944766000.

The previous prime is 20013721264241. The next prime is 20013721264333. The reversal of 20013721264331 is 13346212731002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013721264331 is a prime.

It is a super-2 number, since 2×20013721264331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20013721264291 and 20013721264300.

It is not an unprimeable number, because it can be changed into a prime (20013721264333) 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, 76388248970 + ... + 76388249231.

It is an arithmetic number, because the mean of its divisors is an integer number (5041624440666).

Almost surely, 2^{20013721264331} is an apocalyptic number.

20013721264331 is a deficient number, since it is larger than the sum of its proper divisors (152776498333).

20013721264331 is a wasteful number, since it uses less digits than its factorization.

20013721264331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152776498332.

The product of its (nonzero) digits is 36288, while the sum is 35.

Adding to 20013721264331 its reverse (13346212731002), we get a palindrome (33359933995333).

The spelling of 20013721264331 in words is "twenty trillion, thirteen billion, seven hundred twenty-one million, two hundred sixty-four thousand, three hundred thirty-one".