21703836730 has 8 divisors (see below), whose sum is σ = 39066906132. Its totient is φ = 8681534688.

The previous prime is 21703836647. The next prime is 21703836731. The reversal of 21703836730 is 3763830712.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19906670281 + 1797166449 = 141091^2 + 42393^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21703836731) 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, 1085191827 + ... + 1085191846.

Almost surely, 2^21703836730 is an apocalyptic number.

21703836730 is a deficient number, since it is larger than the sum of its proper divisors (17363069402).

21703836730 is a wasteful number, since it uses less digits than its factorization.

21703836730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170383680.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 21703836730 in words is "twenty-one billion, seven hundred three million, eight hundred thirty-six thousand, seven hundred thirty".