21816767023 has 2 divisors, whose sum is σ = 21816767024. Its totient is φ = 21816767022.

The previous prime is 21816766973. The next prime is 21816767057. The reversal of 21816767023 is 32076761812.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21816767023 - 2²⁹ = 21279896111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21816767083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10908383511 + 10908383512.

It is an arithmetic number, because the mean of its divisors is an integer number (10908383512).

Almost surely, 2^21816767023 is an apocalyptic number.

21816767023 is a deficient number, since it is larger than the sum of its proper divisors (1).

21816767023 is an equidigital number, since it uses as much as digits as its factorization.

21816767023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 21816767023 in words is "twenty-one billion, eight hundred sixteen million, seven hundred sixty-seven thousand, twenty-three".