21321212327 has 2 divisors, whose sum is σ = 21321212328. Its totient is φ = 21321212326.

The previous prime is 21321212309. The next prime is 21321212347. The reversal of 21321212327 is 72321212312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21321212327 - 2⁸ = 21321212071 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21321212296 and 21321212305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321212347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660606163 + 10660606164.

It is an arithmetic number, because the mean of its divisors is an integer number (10660606164).

Almost surely, 2^21321212327 is an apocalyptic number.

21321212327 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321212327 is an equidigital number, since it uses as much as digits as its factorization.

21321212327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 26.

Adding to 21321212327 its reverse (72321212312), we get a palindrome (93642424639).

The spelling of 21321212327 in words is "twenty-one billion, three hundred twenty-one million, two hundred twelve thousand, three hundred twenty-seven".