21726190318 has 16 divisors (see below), whose sum is σ = 37400739840. Its totient is φ = 9272263896.

The previous prime is 21726190303. The next prime is 21726190327. The reversal of 21726190318 is 81309162712.

It is a super-2 number, since 2×21726190318² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3243246 + ... + 3249937.

It is an arithmetic number, because the mean of its divisors is an integer number (2337546240).

Almost surely, 2^21726190318 is an apocalyptic number.

21726190318 is a deficient number, since it is larger than the sum of its proper divisors (15674549522).

21726190318 is a wasteful number, since it uses less digits than its factorization.

21726190318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6493431.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 21726190318 in words is "twenty-one billion, seven hundred twenty-six million, one hundred ninety thousand, three hundred eighteen".