21810134738 has 8 divisors (see below), whose sum is σ = 37388802432. Its totient is φ = 9347200596.

The previous prime is 21810134701. The next prime is 21810134741. The reversal of 21810134738 is 83743101812.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778933370 + ... + 778933397.

It is an arithmetic number, because the mean of its divisors is an integer number (4673600304).

Almost surely, 2^21810134738 is an apocalyptic number.

21810134738 is a deficient number, since it is larger than the sum of its proper divisors (15578667694).

21810134738 is a wasteful number, since it uses less digits than its factorization.

21810134738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557866776.

The product of its (nonzero) digits is 32256, while the sum is 38.

The spelling of 21810134738 in words is "twenty-one billion, eight hundred ten million, one hundred thirty-four thousand, seven hundred thirty-eight".