21836817056 has 12 divisors (see below), whose sum is σ = 42991233642. Its totient is φ = 10918408512.

The previous prime is 21836817053. The next prime is 21836817061. The reversal of 21836817056 is 65071863812.

It can be written as a sum of positive squares in only one way, i.e., 21827107600 + 9709456 = 147740^2 + 3116^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21836817056.

It is not an unprimeable number, because it can be changed into a prime (21836817053) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 341200235 + ... + 341200298.

Almost surely, 2^21836817056 is an apocalyptic number.

It is an amenable number.

21836817056 is a deficient number, since it is larger than the sum of its proper divisors (21154416586).

21836817056 is an equidigital number, since it uses as much as digits as its factorization.

21836817056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682400543 (or 682400535 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 47.

The spelling of 21836817056 in words is "twenty-one billion, eight hundred thirty-six million, eight hundred seventeen thousand, fifty-six".