21130330220123 has 4 divisors (see below), whose sum is σ = 21130637357808. Its totient is φ = 21130023082440.

The previous prime is 21130330220057. The next prime is 21130330220141. The reversal of 21130330220123 is 32102203303112.

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

It is a cyclic number.

It is not a de Polignac number, because 21130330220123 - 2³⁰ = 21129256478299 is a prime.

It is a super-2 number, since 2×21130330220123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21130330220183) 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, 153465623 + ... + 153603248.

It is an arithmetic number, because the mean of its divisors is an integer number (5282659339452).

Almost surely, 2^{21130330220123} is an apocalyptic number.

21130330220123 is a deficient number, since it is larger than the sum of its proper divisors (307137685).

21130330220123 is an equidigital number, since it uses as much as digits as its factorization.

21130330220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307137684.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21130330220123 its reverse (32102203303112), we get a palindrome (53232533523235).

The spelling of 21130330220123 in words is "twenty-one trillion, one hundred thirty billion, three hundred thirty million, two hundred twenty thousand, one hundred twenty-three".