21544142499 has 12 divisors (see below), whose sum is σ = 33948345912. Its totient is φ = 13057056000.

The previous prime is 21544142497. The next prime is 21544142533. The reversal of 21544142499 is 99424144512.

21544142499 is a `hidden beast` number, since 2 + 1 + 544 + 14 + 2 + 4 + 99 = 666.

It is not a de Polignac number, because 21544142499 - 2¹ = 21544142497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21544142491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108808702 + ... + 108808899.

It is an arithmetic number, because the mean of its divisors is an integer number (2829028826).

Almost surely, 2^21544142499 is an apocalyptic number.

21544142499 is a deficient number, since it is larger than the sum of its proper divisors (12404203413).

21544142499 is a wasteful number, since it uses less digits than its factorization.

21544142499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217617618 (or 217617615 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 21544142499 in words is "twenty-one billion, five hundred forty-four million, one hundred forty-two thousand, four hundred ninety-nine".