21330301123 has 4 divisors (see below), whose sum is σ = 21332276280. Its totient is φ = 21328325968.

The previous prime is 21330301033. The next prime is 21330301133. The reversal of 21330301123 is 32110303312.

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 21330301123 - 2²¹ = 21328203971 is a prime.

It is a super-2 number, since 2×21330301123² (a number of 21 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 21330301123.

It is not an unprimeable number, because it can be changed into a prime (21330301133) 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 3 ways as a sum of consecutive naturals, for example, 971290 + ... + 993007.

It is an arithmetic number, because the mean of its divisors is an integer number (5333069070).

Almost surely, 2^21330301123 is an apocalyptic number.

21330301123 is a deficient number, since it is larger than the sum of its proper divisors (1975157).

21330301123 is a wasteful number, since it uses less digits than its factorization.

21330301123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1975156.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21330301123 its reverse (32110303312), we get a palindrome (53440604435).

The spelling of 21330301123 in words is "twenty-one billion, three hundred thirty million, three hundred one thousand, one hundred twenty-three".