21030401323 has 4 divisors (see below), whose sum is σ = 21183908040. Its totient is φ = 20876894608.

The previous prime is 21030401299. The next prime is 21030401339. The reversal of 21030401323 is 32310403012.

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 21030401323 - 2²⁵ = 20996846891 is a prime.

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 21030401323.

It is not an unprimeable number, because it can be changed into a prime (21030401393) 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, 76753153 + ... + 76753426.

It is an arithmetic number, because the mean of its divisors is an integer number (5295977010).

Almost surely, 2^21030401323 is an apocalyptic number.

21030401323 is a deficient number, since it is larger than the sum of its proper divisors (153506717).

21030401323 is a wasteful number, since it uses less digits than its factorization.

21030401323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153506716.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21030401323 its reverse (32310403012), we get a palindrome (53340804335).

The spelling of 21030401323 in words is "twenty-one billion, thirty million, four hundred one thousand, three hundred twenty-three".