21272945843 has 8 divisors (see below), whose sum is σ = 21759485760. Its totient is φ = 20787819520.

The previous prime is 21272945833. The next prime is 21272945879. The reversal of 21272945843 is 34854927212.

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 21272945843 - 2⁸ = 21272945587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21272945833) 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, 322928 + ... + 383181.

It is an arithmetic number, because the mean of its divisors is an integer number (2719935720).

Almost surely, 2^21272945843 is an apocalyptic number.

21272945843 is a deficient number, since it is larger than the sum of its proper divisors (486539917).

21272945843 is an equidigital number, since it uses as much as digits as its factorization.

21272945843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706797.

The product of its digits is 967680, while the sum is 47.

The spelling of 21272945843 in words is "twenty-one billion, two hundred seventy-two million, nine hundred forty-five thousand, eight hundred forty-three".