20131120321 has 8 divisors (see below), whose sum is σ = 22265605544. Its totient is φ = 18080340480.

The previous prime is 20131120297. The next prime is 20131120337. The reversal of 20131120321 is 12302113102.

It can be written as a sum of positive squares in 4 ways, for example, as 2869102096 + 17262018225 = 53564^2 + 131385^2 .

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 20131120321 - 2⁹ = 20131119809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20131120295 and 20131120304.

It is not an unprimeable number, because it can be changed into a prime (20131120381) 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, 20925840 + ... + 20926801.

It is an arithmetic number, because the mean of its divisors is an integer number (2783200693).

Almost surely, 2^20131120321 is an apocalyptic number.

It is an amenable number.

20131120321 is a deficient number, since it is larger than the sum of its proper divisors (2134485223).

20131120321 is a wasteful number, since it uses less digits than its factorization.

20131120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41852691.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 20131120321 its reverse (12302113102), we get a palindrome (32433233423).

The spelling of 20131120321 in words is "twenty billion, one hundred thirty-one million, one hundred twenty thousand, three hundred twenty-one".