21241276643 has 8 divisors (see below), whose sum is σ = 21289443360. Its totient is φ = 21193159680.

The previous prime is 21241276631. The next prime is 21241276673. The reversal of 21241276643 is 34667214212.

It is a happy number.

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 21241276643 - 2⁴ = 21241276627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21241276597 and 21241276606.

It is not an unprimeable number, because it can be changed into a prime (21241276673) 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, 919946 + ... + 942752.

It is an arithmetic number, because the mean of its divisors is an integer number (2661180420).

Almost surely, 2^21241276643 is an apocalyptic number.

21241276643 is a deficient number, since it is larger than the sum of its proper divisors (48166717).

21241276643 is a wasteful number, since it uses less digits than its factorization.

21241276643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24877.

The product of its digits is 96768, while the sum is 38.

The spelling of 21241276643 in words is "twenty-one billion, two hundred forty-one million, two hundred seventy-six thousand, six hundred forty-three".