21811935463 has 2 divisors, whose sum is σ = 21811935464. Its totient is φ = 21811935462.

The previous prime is 21811935413. The next prime is 21811935469. The reversal of 21811935463 is 36453911812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21811935463 - 2³³ = 13222000871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21811935469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10905967731 + 10905967732.

It is an arithmetic number, because the mean of its divisors is an integer number (10905967732).

Almost surely, 2^21811935463 is an apocalyptic number.

21811935463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21811935463 is an equidigital number, since it uses as much as digits as its factorization.

21811935463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The spelling of 21811935463 in words is "twenty-one billion, eight hundred eleven million, nine hundred thirty-five thousand, four hundred sixty-three".