21300312423 has 16 divisors (see below), whose sum is σ = 30588123776. Its totient is φ = 13106573280.

The previous prime is 21300312419. The next prime is 21300312479. The reversal of 21300312423 is 32421300312.

It is not a de Polignac number, because 21300312423 - 2² = 21300312419 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 21300312423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300311423) 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, 492936 + ... + 534402.

It is an arithmetic number, because the mean of its divisors is an integer number (1911757736).

Almost surely, 2^21300312423 is an apocalyptic number.

21300312423 is a deficient number, since it is larger than the sum of its proper divisors (9287811353).

21300312423 is a wasteful number, since it uses less digits than its factorization.

21300312423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54654.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21300312423 its reverse (32421300312), we get a palindrome (53721612735).

The spelling of 21300312423 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, four hundred twenty-three".