21819663836308 has 48 divisors (see below), whose sum is σ = 42559427569680. Its totient is φ = 9718833890304.

The previous prime is 21819663836273. The next prime is 21819663836309. The reversal of 21819663836308 is 80363836691812.

It can be written as a sum of positive squares in 8 ways, for example, as 764946150544 + 21054717685764 = 874612^2 + 4588542^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21819663836308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21819663836309) 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, 113535 + ... + 6606982.

It is an arithmetic number, because the mean of its divisors is an integer number (886654741035).

Almost surely, 2^{21819663836308} is an apocalyptic number.

It is an amenable number.

21819663836308 is a deficient number, since it is larger than the sum of its proper divisors (20739763733372).

21819663836308 is a wasteful number, since it uses less digits than its factorization.

21819663836308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6722716 (or 6722714 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 64.

The spelling of 21819663836308 in words is "twenty-one trillion, eight hundred nineteen billion, six hundred sixty-three million, eight hundred thirty-six thousand, three hundred eight".