21300451326 has 48 divisors (see below), whose sum is σ = 57538885248. Its totient is φ = 5532584400.

The previous prime is 21300451307. The next prime is 21300451327. The reversal of 21300451326 is 62315400312.

It is a self number, because there is not a number n which added to its sum of digits gives 21300451326.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300451327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7682760 + ... + 7685531.

It is an arithmetic number, because the mean of its divisors is an integer number (1198726776).

Almost surely, 2^21300451326 is an apocalyptic number.

21300451326 is an abundant number, since it is smaller than the sum of its proper divisors (36238433922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21300451326 is a wasteful number, since it uses less digits than its factorization.

21300451326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15368317 (or 15368314 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

Adding to 21300451326 its reverse (62315400312), we get a palindrome (83615851638).

The spelling of 21300451326 in words is "twenty-one billion, three hundred million, four hundred fifty-one thousand, three hundred twenty-six".