21813383863 has 2 divisors, whose sum is σ = 21813383864. Its totient is φ = 21813383862.

The previous prime is 21813383819. The next prime is 21813383881. The reversal of 21813383863 is 36838331812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21813383863 - 2⁹ = 21813383351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21813383663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10906691931 + 10906691932.

It is an arithmetic number, because the mean of its divisors is an integer number (10906691932).

Almost surely, 2^21813383863 is an apocalyptic number.

21813383863 is a deficient number, since it is larger than the sum of its proper divisors (1).

21813383863 is an equidigital number, since it uses as much as digits as its factorization.

21813383863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The spelling of 21813383863 in words is "twenty-one billion, eight hundred thirteen million, three hundred eighty-three thousand, eight hundred sixty-three".