12121112330021 has 4 divisors (see below), whose sum is σ = 12122239571532. Its totient is φ = 12119985088512.

The previous prime is 12121112329883. The next prime is 12121112330023. The reversal of 12121112330021 is 12003321112121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5663262417121 + 6457849912900 = 2379761^2 + 2541230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121112330021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121112329975 and 12121112330002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121112330023) 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, 563604626 + ... + 563626131.

It is an arithmetic number, because the mean of its divisors is an integer number (3030559892883).

Almost surely, 2^{12121112330021} is an apocalyptic number.

It is an amenable number.

12121112330021 is a deficient number, since it is larger than the sum of its proper divisors (1127241511).

12121112330021 is a wasteful number, since it uses less digits than its factorization.

12121112330021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127241510.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 12121112330021 its reverse (12003321112121), we get a palindrome (24124433442142).

The spelling of 12121112330021 in words is "twelve trillion, one hundred twenty-one billion, one hundred twelve million, three hundred thirty thousand, twenty-one".