20321012121 has 8 divisors (see below), whose sum is σ = 27112764000. Its totient is φ = 13538300832.

The previous prime is 20321012087. The next prime is 20321012123. The reversal of 20321012121 is 12121012302.

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

It is not a de Polignac number, because 20321012121 - 2²¹ = 20318914969 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20321012121.

It is not an unprimeable number, because it can be changed into a prime (20321012123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2254900 + ... + 2263893.

It is an arithmetic number, because the mean of its divisors is an integer number (3389095500).

Almost surely, 2^20321012121 is an apocalyptic number.

It is an amenable number.

20321012121 is a deficient number, since it is larger than the sum of its proper divisors (6791751879).

20321012121 is a wasteful number, since it uses less digits than its factorization.

20321012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4520295.

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

Adding to 20321012121 its reverse (12121012302), we get a palindrome (32442024423).

The spelling of 20321012121 in words is "twenty billion, three hundred twenty-one million, twelve thousand, one hundred twenty-one".