21470165706 has 48 divisors (see below), whose sum is σ = 47543614272. Its totient is φ = 6458591040.

The previous prime is 21470165687. The next prime is 21470165711. The reversal of 21470165706 is 60756107412.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8470 + ... + 207393.

It is an arithmetic number, because the mean of its divisors is an integer number (990491964).

Almost surely, 2^21470165706 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21470165706, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23771807136).

21470165706 is an abundant number, since it is smaller than the sum of its proper divisors (26073448566).

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

21470165706 is a wasteful number, since it uses less digits than its factorization.

21470165706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216027 (or 216016 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 39.

The spelling of 21470165706 in words is "twenty-one billion, four hundred seventy million, one hundred sixty-five thousand, seven hundred six".