21597428606 has 16 divisors (see below), whose sum is σ = 35102198544. Its totient is φ = 9906888384.

The previous prime is 21597428603. The next prime is 21597428617. The reversal of 21597428606 is 60682479512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21597428603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2543831 + ... + 2552306.

It is an arithmetic number, because the mean of its divisors is an integer number (2193887409).

Almost surely, 2^21597428606 is an apocalyptic number.

21597428606 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21597428606 is a deficient number, since it is larger than the sum of its proper divisors (13504769938).

21597428606 is a wasteful number, since it uses less digits than its factorization.

21597428606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096315.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 21597428606 in words is "twenty-one billion, five hundred ninety-seven million, four hundred twenty-eight thousand, six hundred six".