10521665071 has 4 divisors (see below), whose sum is σ = 10535035192. Its totient is φ = 10508294952.

The previous prime is 10521665069. The next prime is 10521665087. The reversal of 10521665071 is 17056612501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17056612501 = 43 ⋅396665407.

It is a cyclic number.

It is not a de Polignac number, because 10521665071 - 2¹ = 10521665069 is a prime.

It is a super-2 number, since 2×10521665071² (a number of 21 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 (10521665171) 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, 6683880 + ... + 6685453.

It is an arithmetic number, because the mean of its divisors is an integer number (2633758798).

Almost surely, 2^10521665071 is an apocalyptic number.

10521665071 is a deficient number, since it is larger than the sum of its proper divisors (13370121).

10521665071 is an equidigital number, since it uses as much as digits as its factorization.

10521665071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13370120.

The product of its (nonzero) digits is 12600, while the sum is 34.

The spelling of 10521665071 in words is "ten billion, five hundred twenty-one million, six hundred sixty-five thousand, seventy-one".