21300312133 has 8 divisors (see below), whose sum is σ = 22021111296. Its totient is φ = 20581618800.

The previous prime is 21300312127. The next prime is 21300312139. The reversal of 21300312133 is 33121300312.

It is an interprime number because it is at equal distance from previous prime (21300312127) and next prime (21300312139).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21300312133 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 21300312133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300312139) 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, 505873 + ... + 546358.

It is an arithmetic number, because the mean of its divisors is an integer number (2752638912).

Almost surely, 2^21300312133 is an apocalyptic number.

It is an amenable number.

21300312133 is a deficient number, since it is larger than the sum of its proper divisors (720799163).

21300312133 is a wasteful number, since it uses less digits than its factorization.

21300312133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052915.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21300312133 its reverse (33121300312), we get a palindrome (54421612445).

The spelling of 21300312133 in words is "twenty-one billion, three hundred million, three hundred twelve thousand, one hundred thirty-three".