21144504423 has 16 divisors (see below), whose sum is σ = 32969505536. Its totient is φ = 11801583360.

The previous prime is 21144504421. The next prime is 21144504439. The reversal of 21144504423 is 32440544112.

It is not a de Polignac number, because 21144504423 - 2¹ = 21144504421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144504421) 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, 11707018 + ... + 11708823.

It is an arithmetic number, because the mean of its divisors is an integer number (2060594096).

Almost surely, 2^21144504423 is an apocalyptic number.

21144504423 is a deficient number, since it is larger than the sum of its proper divisors (11825001113).

21144504423 is a wasteful number, since it uses less digits than its factorization.

21144504423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23415894.

The product of its (nonzero) digits is 15360, while the sum is 30.

The spelling of 21144504423 in words is "twenty-one billion, one hundred forty-four million, five hundred four thousand, four hundred twenty-three".