21696780323 has 2 divisors, whose sum is σ = 21696780324. Its totient is φ = 21696780322.

The previous prime is 21696780319. The next prime is 21696780367. The reversal of 21696780323 is 32308769612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21696780323 - 2² = 21696780319 is a prime.

It is a super-3 number, since 3×21696780323³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21696780023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10848390161 + 10848390162.

It is an arithmetic number, because the mean of its divisors is an integer number (10848390162).

Almost surely, 2^21696780323 is an apocalyptic number.

21696780323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21696780323 is an equidigital number, since it uses as much as digits as its factorization.

21696780323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 21696780323 in words is "twenty-one billion, six hundred ninety-six million, seven hundred eighty thousand, three hundred twenty-three".