13123120021021 has 8 divisors (see below), whose sum is σ = 13558215794688. Its totient is φ = 12688759830000.

The previous prime is 13123120020919. The next prime is 13123120021051. The reversal of 13123120021021 is 12012002132131.

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 13123120021021 - 2³³ = 13114530086429 is a prime.

It is a super-2 number, since 2×13123120021021² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13123120021021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13123120021051) 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, 183859390 + ... + 183930751.

It is an arithmetic number, because the mean of its divisors is an integer number (1694776974336).

Almost surely, 2^{13123120021021} is an apocalyptic number.

It is an amenable number.

13123120021021 is a deficient number, since it is larger than the sum of its proper divisors (435095773667).

13123120021021 is a wasteful number, since it uses less digits than its factorization.

13123120021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367791323.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 13123120021021 its reverse (12012002132131), we get a palindrome (25135122153152).

The spelling of 13123120021021 in words is "thirteen trillion, one hundred twenty-three billion, one hundred twenty million, twenty-one thousand, twenty-one".