21124545423 has 16 divisors (see below), whose sum is σ = 29825831520. Its totient is φ = 13253308416.

The previous prime is 21124545391. The next prime is 21124545461. The reversal of 21124545423 is 32454542112.

It is not a de Polignac number, because 21124545423 - 2⁵ = 21124545391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124545493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933183 + ... + 955551.

It is an arithmetic number, because the mean of its divisors is an integer number (1864114470).

Almost surely, 2^21124545423 is an apocalyptic number.

21124545423 is a deficient number, since it is larger than the sum of its proper divisors (8701286097).

21124545423 is a wasteful number, since it uses less digits than its factorization.

21124545423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40906.

The product of its digits is 38400, while the sum is 33.

The spelling of 21124545423 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, four hundred twenty-three".