10243666521 has 27 divisors (see below), whose sum is σ = 16269124053. Its totient is φ = 6206258520.

The previous prime is 10243666493. The next prime is 10243666547. The reversal of 10243666521 is 12566634201.

The square root of 10243666521 is 101211.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 10243666521 - 2²⁵ = 10210112089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10243666571) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3338430 + ... + 3341496.

Almost surely, 2^10243666521 is an apocalyptic number.

10243666521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10243666521 is the 101211-st square number.

10243666521 is the 50606-th centered octagonal number.

It is an amenable number.

10243666521 is a deficient number, since it is larger than the sum of its proper divisors (6025457532).

10243666521 is an frugal number, since it uses more digits than its factorization.

10243666521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6162 (or 3081 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Multiplying 10243666521 by its sum of digits (36), we get a square (368771994756 = 607266²).

The spelling of 10243666521 in words is "ten billion, two hundred forty-three million, six hundred sixty-six thousand, five hundred twenty-one".