20131120221 has 8 divisors (see below), whose sum is σ = 27347937120. Its totient is φ = 13167525072.

The previous prime is 20131120189. The next prime is 20131120259. The reversal of 20131120221 is 12202113102.

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

It is not a de Polignac number, because 20131120221 - 2⁵ = 20131120189 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20131120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20131120421) 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, 63305251 + ... + 63305568.

It is an arithmetic number, because the mean of its divisors is an integer number (3418492140).

Almost surely, 2^20131120221 is an apocalyptic number.

It is an amenable number.

20131120221 is a deficient number, since it is larger than the sum of its proper divisors (7216816899).

20131120221 is a wasteful number, since it uses less digits than its factorization.

20131120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126610875.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20131120221 its reverse (12202113102), we get a palindrome (32333233323).

The spelling of 20131120221 in words is "twenty billion, one hundred thirty-one million, one hundred twenty thousand, two hundred twenty-one".