21120123033013 has 4 divisors (see below), whose sum is σ = 21249694340128. Its totient is φ = 20990551725900.

The previous prime is 21120123032989. The next prime is 21120123033043. The reversal of 21120123033013 is 31033032102112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120123033013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120123033043) 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, 64785653313 + ... + 64785653638.

It is an arithmetic number, because the mean of its divisors is an integer number (5312423585032).

Almost surely, 2^{21120123033013} is an apocalyptic number.

It is an amenable number.

21120123033013 is a deficient number, since it is larger than the sum of its proper divisors (129571307115).

21120123033013 is a wasteful number, since it uses less digits than its factorization.

21120123033013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129571307114.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 21120123033013 its reverse (31033032102112), we get a palindrome (52153155135125).

The spelling of 21120123033013 in words is "twenty-one trillion, one hundred twenty billion, one hundred twenty-three million, thirty-three thousand, thirteen".