21423536807 has 2 divisors, whose sum is σ = 21423536808. Its totient is φ = 21423536806.

The previous prime is 21423536791. The next prime is 21423536831. The reversal of 21423536807 is 70863532412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21423536807 - 2⁴ = 21423536791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423536837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711768403 + 10711768404.

It is an arithmetic number, because the mean of its divisors is an integer number (10711768404).

Almost surely, 2^21423536807 is an apocalyptic number.

21423536807 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423536807 is an equidigital number, since it uses as much as digits as its factorization.

21423536807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 241920, while the sum is 41.

The spelling of 21423536807 in words is "twenty-one billion, four hundred twenty-three million, five hundred thirty-six thousand, eight hundred seven".