21523268274535 has 16 divisors (see below), whose sum is σ = 26461712999232. Its totient is φ = 16801087564800.

The previous prime is 21523268274517. The next prime is 21523268274539. The reversal of 21523268274535 is 53547286232512.

It is not a de Polignac number, because 21523268274535 - 2¹¹ = 21523268272487 is a prime.

It is a super-2 number, since 2×21523268274535² (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 (21523268274539) 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, 312485796 + ... + 312554665.

It is an arithmetic number, because the mean of its divisors is an integer number (1653857062452).

Almost surely, 2^{21523268274535} is an apocalyptic number.

21523268274535 is a deficient number, since it is larger than the sum of its proper divisors (4938444724697).

21523268274535 is an equidigital number, since it uses as much as digits as its factorization.

21523268274535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625040634.

The product of its digits is 24192000, while the sum is 55.

The spelling of 21523268274535 in words is "twenty-one trillion, five hundred twenty-three billion, two hundred sixty-eight million, two hundred seventy-four thousand, five hundred thirty-five".