21642221323 has 2 divisors, whose sum is σ = 21642221324. Its totient is φ = 21642221322.

The previous prime is 21642221291. The next prime is 21642221329. The reversal of 21642221323 is 32312224612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21642221323 - 2⁵ = 21642221291 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21642221291 and 21642221300.

It is not a weakly prime, because it can be changed into another prime (21642221329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10821110661 + 10821110662.

It is an arithmetic number, because the mean of its divisors is an integer number (10821110662).

Almost surely, 2^21642221323 is an apocalyptic number.

21642221323 is a deficient number, since it is larger than the sum of its proper divisors (1).

21642221323 is an equidigital number, since it uses as much as digits as its factorization.

21642221323 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

Adding to 21642221323 its reverse (32312224612), we get a palindrome (53954445935).

The spelling of 21642221323 in words is "twenty-one billion, six hundred forty-two million, two hundred twenty-one thousand, three hundred twenty-three".