21030012011323 has 16 divisors (see below), whose sum is σ = 24059812608000. Its totient is φ = 18006599433312.

The previous prime is 21030012011297. The next prime is 21030012011329. The reversal of 21030012011323 is 32311021003012.

It is not a de Polignac number, because 21030012011323 - 2²⁵ = 21029978456891 is a prime.

It is a super-2 number, since 2×21030012011323² (a number of 27 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 21030012011323.

It is not an unprimeable number, because it can be changed into a prime (21030012011329) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25667838 + ... + 26474476.

It is an arithmetic number, because the mean of its divisors is an integer number (1503738288000).

Almost surely, 2^{21030012011323} is an apocalyptic number.

21030012011323 is a deficient number, since it is larger than the sum of its proper divisors (3029800596677).

21030012011323 is a wasteful number, since it uses less digits than its factorization.

21030012011323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810594.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 21030012011323 its reverse (32311021003012), we get a palindrome (53341033014335).

The spelling of 21030012011323 in words is "twenty-one trillion, thirty billion, twelve million, eleven thousand, three hundred twenty-three".