21244123943 has 12 divisors (see below), whose sum is σ = 24323082672. Its totient is φ = 18176214720.

The previous prime is 21244123921. The next prime is 21244123963. The reversal of 21244123943 is 34932144212.

It is not a de Polignac number, because 21244123943 - 2¹⁰ = 21244122919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21244123963) 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, 10637021 + ... + 10639017.

It is an arithmetic number, because the mean of its divisors is an integer number (2026923556).

Almost surely, 2^21244123943 is an apocalyptic number.

21244123943 is a deficient number, since it is larger than the sum of its proper divisors (3078958729).

21244123943 is an frugal number, since it uses more digits than its factorization.

21244123943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4762 (or 2765 counting only the distinct ones).

The product of its digits is 41472, while the sum is 35.

The spelling of 21244123943 in words is "twenty-one billion, two hundred forty-four million, one hundred twenty-three thousand, nine hundred forty-three".