21003120023 has 8 divisors (see below), whose sum is σ = 21373486176. Its totient is φ = 20633594400.

The previous prime is 21003120007. The next prime is 21003120053. The reversal of 21003120023 is 32002130012.

It is a happy number.

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 21003120023 - 2⁴ = 21003120007 is a prime.

It is a super-2 number, since 2×21003120023² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21003120053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159611 + ... + 259772.

It is an arithmetic number, because the mean of its divisors is an integer number (2671685772).

Almost surely, 2^21003120023 is an apocalyptic number.

21003120023 is a deficient number, since it is larger than the sum of its proper divisors (370366153).

21003120023 is an equidigital number, since it uses as much as digits as its factorization.

21003120023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420265.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21003120023 its reverse (32002130012), we get a palindrome (53005250035).

The spelling of 21003120023 in words is "twenty-one billion, three million, one hundred twenty thousand, twenty-three".