21710305616 has 20 divisors (see below), whose sum is σ = 44277597600. Its totient is φ = 10283828832.

The previous prime is 21710305607. The next prime is 21710305619. The reversal of 21710305616 is 61650301712.

It is a super-2 number, since 2×21710305616² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21710305619) 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, 35707436 + ... + 35708043.

It is an arithmetic number, because the mean of its divisors is an integer number (2213879880).

Almost surely, 2^21710305616 is an apocalyptic number.

It is an amenable number.

21710305616 is an abundant number, since it is smaller than the sum of its proper divisors (22567291984).

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

21710305616 is a wasteful number, since it uses less digits than its factorization.

21710305616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71415506 (or 71415500 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 32.

The spelling of 21710305616 in words is "twenty-one billion, seven hundred ten million, three hundred five thousand, six hundred sixteen".