21003313321123 has 64 divisors (see below), whose sum is σ = 27581347584000. Its totient is φ = 15574255893504.

The previous prime is 21003313321093. The next prime is 21003313321171. The reversal of 21003313321123 is 32112331330012.

It is not a de Polignac number, because 21003313321123 - 2¹⁷ = 21003313190051 is a prime.

It is a super-2 number, since 2×21003313321123² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21003313321223) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6565161 + ... + 9225397.

It is an arithmetic number, because the mean of its divisors is an integer number (430958556000).

Almost surely, 2^{21003313321123} is an apocalyptic number.

21003313321123 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21003313321123 is a deficient number, since it is larger than the sum of its proper divisors (6578034262877).

21003313321123 is a wasteful number, since it uses less digits than its factorization.

21003313321123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2660404.

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 21003313321123 its reverse (32112331330012), we get a palindrome (53115644651135).

The spelling of 21003313321123 in words is "twenty-one trillion, three billion, three hundred thirteen million, three hundred twenty-one thousand, one hundred twenty-three".