21470071126517 has 8 divisors (see below), whose sum is σ = 23121754184760. Its totient is φ = 19818407943360.

The previous prime is 21470071126499. The next prime is 21470071126523. The reversal of 21470071126517 is 71562117007412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81952803076 + 21388118323441 = 286274^2 + 4624729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21470071126517 - 2⁴² = 17072024615413 is a prime.

It is a super-2 number, since 2×21470071126517² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21470071126417) 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, 2686334 + ... + 7082127.

It is an arithmetic number, because the mean of its divisors is an integer number (2890219273095).

Almost surely, 2^{21470071126517} is an apocalyptic number.

It is an amenable number.

21470071126517 is a deficient number, since it is larger than the sum of its proper divisors (1651683058243).

21470071126517 is a wasteful number, since it uses less digits than its factorization.

21470071126517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9937543.

The product of its (nonzero) digits is 164640, while the sum is 44.

The spelling of 21470071126517 in words is "twenty-one trillion, four hundred seventy billion, seventy-one million, one hundred twenty-six thousand, five hundred seventeen".