21304533243 has 16 divisors (see below), whose sum is σ = 32651709696. Its totient is φ = 12103646880.

The previous prime is 21304533221. The next prime is 21304533277. The reversal of 21304533243 is 34233540312.

It is not a de Polignac number, because 21304533243 - 2¹⁰ = 21304532219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21304533243.

It is not an unprimeable number, because it can be changed into a prime (21304533293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2928453 + ... + 2935718.

It is an arithmetic number, because the mean of its divisors is an integer number (2040731856).

Almost surely, 2^21304533243 is an apocalyptic number.

21304533243 is a deficient number, since it is larger than the sum of its proper divisors (11347176453).

21304533243 is a wasteful number, since it uses less digits than its factorization.

21304533243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5864354.

The product of its (nonzero) digits is 25920, while the sum is 30.

The spelling of 21304533243 in words is "twenty-one billion, three hundred four million, five hundred thirty-three thousand, two hundred forty-three".