21725316606 has 32 divisors (see below), whose sum is σ = 49991155200. Its totient is φ = 6165572256.

The previous prime is 21725316589. The next prime is 21725316631. The reversal of 21725316606 is 60661352712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1729546 + ... + 1742061.

It is an arithmetic number, because the mean of its divisors is an integer number (1562223600).

Almost surely, 2^21725316606 is an apocalyptic number.

21725316606 is an abundant number, since it is smaller than the sum of its proper divisors (28265838594).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21725316606 is a wasteful number, since it uses less digits than its factorization.

21725316606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471768.

The product of its (nonzero) digits is 90720, while the sum is 39.

The spelling of 21725316606 in words is "twenty-one billion, seven hundred twenty-five million, three hundred sixteen thousand, six hundred six".