21936478327 has 2 divisors, whose sum is σ = 21936478328. Its totient is φ = 21936478326.

The previous prime is 21936478273. The next prime is 21936478331. The reversal of 21936478327 is 72387463912.

Together with previous prime (21936478273) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21936478327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21936478387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10968239163 + 10968239164.

It is an arithmetic number, because the mean of its divisors is an integer number (10968239164).

Almost surely, 2^21936478327 is an apocalyptic number.

21936478327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21936478327 is an equidigital number, since it uses as much as digits as its factorization.

21936478327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 52.

The spelling of 21936478327 in words is "twenty-one billion, nine hundred thirty-six million, four hundred seventy-eight thousand, three hundred twenty-seven".