21653804743 has 2 divisors, whose sum is σ = 21653804744. Its totient is φ = 21653804742.

The previous prime is 21653804707. The next prime is 21653804789. The reversal of 21653804743 is 34740835612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21653804743 - 2⁹ = 21653804231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21653804743.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21653804243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826902371 + 10826902372.

It is an arithmetic number, because the mean of its divisors is an integer number (10826902372).

Almost surely, 2^21653804743 is an apocalyptic number.

21653804743 is a deficient number, since it is larger than the sum of its proper divisors (1).

21653804743 is an equidigital number, since it uses as much as digits as its factorization.

21653804743 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 483840, while the sum is 43.

The spelling of 21653804743 in words is "twenty-one billion, six hundred fifty-three million, eight hundred four thousand, seven hundred forty-three".