21894946243 has 8 divisors (see below), whose sum is σ = 21923942112. Its totient is φ = 21865972416.

The previous prime is 21894946237. The next prime is 21894946273. The reversal of 21894946243 is 34264949812.

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

It is a cyclic number.

It is not a de Polignac number, because 21894946243 - 2¹⁷ = 21894815171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21894946273) 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, 2885871 + ... + 2893447.

It is an arithmetic number, because the mean of its divisors is an integer number (2740492764).

Almost surely, 2^21894946243 is an apocalyptic number.

21894946243 is a deficient number, since it is larger than the sum of its proper divisors (28995869).

21894946243 is a wasteful number, since it uses less digits than its factorization.

21894946243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11021.

The product of its digits is 2985984, while the sum is 52.

The spelling of 21894946243 in words is "twenty-one billion, eight hundred ninety-four million, nine hundred forty-six thousand, two hundred forty-three".