21601338223 has 2 divisors, whose sum is σ = 21601338224. Its totient is φ = 21601338222.

The previous prime is 21601338173. The next prime is 21601338247. The reversal of 21601338223 is 32283310612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21601338223 - 2²¹ = 21599241071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21601338323) 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, 10800669111 + 10800669112.

It is an arithmetic number, because the mean of its divisors is an integer number (10800669112).

Almost surely, 2^21601338223 is an apocalyptic number.

21601338223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601338223 is an equidigital number, since it uses as much as digits as its factorization.

21601338223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

Adding to 21601338223 its reverse (32283310612), we get a palindrome (53884648835).

The spelling of 21601338223 in words is "twenty-one billion, six hundred one million, three hundred thirty-eight thousand, two hundred twenty-three".