20320120121 has 24 divisors (see below), whose sum is σ = 23816989440. Its totient is φ = 17285637600.

The previous prime is 20320120087. The next prime is 20320120123. The reversal of 20320120121 is 12102102302.

It is a happy number.

It is not a de Polignac number, because 20320120121 - 2¹⁸ = 20319857977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20320120096 and 20320120105.

It is not an unprimeable number, because it can be changed into a prime (20320120123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3711416 + ... + 3716886.

It is an arithmetic number, because the mean of its divisors is an integer number (992374560).

Almost surely, 2^20320120121 is an apocalyptic number.

It is an amenable number.

20320120121 is a deficient number, since it is larger than the sum of its proper divisors (3496869319).

20320120121 is a wasteful number, since it uses less digits than its factorization.

20320120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6045 (or 6038 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20320120121 its reverse (12102102302), we get a palindrome (32422222423).

It can be divided in two parts, 203201 and 20121, that added together give a palindrome (223322).

The spelling of 20320120121 in words is "twenty billion, three hundred twenty million, one hundred twenty thousand, one hundred twenty-one".