21470071664017 has 16 divisors (see below), whose sum is σ = 22741913657232. Its totient is φ = 20199219609600.

The previous prime is 21470071663981. The next prime is 21470071664033. The reversal of 21470071664017 is 71046617007412.

It can be written as a sum of positive squares in 8 ways, for example, as 485573442561 + 20984498221456 = 696831^2 + 4580884^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21470071664017 is a prime.

It is a super-2 number, since 2×21470071664017² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21470071644017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 736851673 + ... + 736880809.

It is an arithmetic number, because the mean of its divisors is an integer number (1421369603577).

Almost surely, 2^{21470071664017} is an apocalyptic number.

It is an amenable number.

21470071664017 is a deficient number, since it is larger than the sum of its proper divisors (1271841993215).

21470071664017 is a wasteful number, since it uses less digits than its factorization.

21470071664017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44628.

The product of its (nonzero) digits is 395136, while the sum is 46.

The spelling of 21470071664017 in words is "twenty-one trillion, four hundred seventy billion, seventy-one million, six hundred sixty-four thousand, seventeen".