21546112523 has 16 divisors (see below), whose sum is σ = 24573755136. Its totient is φ = 18740034720.

The previous prime is 21546112481. The next prime is 21546112531. The reversal of 21546112523 is 32521164512.

It is a cyclic number.

It is not a de Polignac number, because 21546112523 - 2⁸ = 21546112267 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21546112523.

It is not an unprimeable number, because it can be changed into a prime (21546112543) 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, 517733 + ... + 557798.

It is an arithmetic number, because the mean of its divisors is an integer number (1535859696).

Almost surely, 2^21546112523 is an apocalyptic number.

21546112523 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21546112523 is a deficient number, since it is larger than the sum of its proper divisors (3027642613).

21546112523 is a wasteful number, since it uses less digits than its factorization.

21546112523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075634.

The product of its digits is 14400, while the sum is 32.

The spelling of 21546112523 in words is "twenty-one billion, five hundred forty-six million, one hundred twelve thousand, five hundred twenty-three".