21544343023 has 8 divisors (see below), whose sum is σ = 24638544000. Its totient is φ = 18454251480.

The previous prime is 21544343003. The next prime is 21544343057. The reversal of 21544343023 is 32034344512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21544343023 - 2⁹ = 21544342511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21544343003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1016113 + ... + 1037098.

It is an arithmetic number, because the mean of its divisors is an integer number (3079818000).

Almost surely, 2^21544343023 is an apocalyptic number.

21544343023 is a deficient number, since it is larger than the sum of its proper divisors (3094200977).

21544343023 is a wasteful number, since it uses less digits than its factorization.

21544343023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2054717.

The product of its (nonzero) digits is 34560, while the sum is 31.

Adding to 21544343023 its reverse (32034344512), we get a palindrome (53578687535).

The spelling of 21544343023 in words is "twenty-one billion, five hundred forty-four million, three hundred forty-three thousand, twenty-three".