21300312443 has 8 divisors (see below), whose sum is σ = 22943394816. Its totient is φ = 19716978600.

The previous prime is 21300312419. The next prime is 21300312479. The reversal of 21300312443 is 34421300312.

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 21300312443 - 2⁶ = 21300312379 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21300312643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14936393 + ... + 14937818.

It is an arithmetic number, because the mean of its divisors is an integer number (2867924352).

Almost surely, 2^21300312443 is an apocalyptic number.

21300312443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21300312443 is a deficient number, since it is larger than the sum of its proper divisors (1643082373).

21300312443 is a wasteful number, since it uses less digits than its factorization.

21300312443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29874265.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21300312443 its reverse (34421300312), we get a palindrome (55721612755).

The spelling of 21300312443 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, four hundred forty-three".