21313113628633 has 4 divisors (see below), whose sum is σ = 21315152586148. Its totient is φ = 21311074671120.

The previous prime is 21313113628591. The next prime is 21313113628657. The reversal of 21313113628633 is 33682631131312.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15639747002944 + 5673366625689 = 3954712^2 + 2381883^2 .

It is a cyclic number.

It is not a de Polignac number, because 21313113628633 - 2¹⁷ = 21313113497561 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 21313113628633.

It is not an unprimeable number, because it can be changed into a prime (21313113628033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019463078 + ... + 1019483983.

It is an arithmetic number, because the mean of its divisors is an integer number (5328788146537).

Almost surely, 2^{21313113628633} is an apocalyptic number.

It is an amenable number.

21313113628633 is a deficient number, since it is larger than the sum of its proper divisors (2038957515).

21313113628633 is a wasteful number, since it uses less digits than its factorization.

21313113628633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038957514.

The product of its digits is 279936, while the sum is 43.

Adding to 21313113628633 its reverse (33682631131312), we get a palindrome (54995744759945).

The spelling of 21313113628633 in words is "twenty-one trillion, three hundred thirteen billion, one hundred thirteen million, six hundred twenty-eight thousand, six hundred thirty-three".