21544923319 has 2 divisors, whose sum is σ = 21544923320. Its totient is φ = 21544923318.

The previous prime is 21544923313. The next prime is 21544923341. The reversal of 21544923319 is 91332944512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21544923319 - 2¹¹ = 21544921271 is a prime.

It is a super-2 number, since 2×21544923319² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21544923313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10772461659 + 10772461660.

It is an arithmetic number, because the mean of its divisors is an integer number (10772461660).

Almost surely, 2^21544923319 is an apocalyptic number.

21544923319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21544923319 is an equidigital number, since it uses as much as digits as its factorization.

21544923319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The spelling of 21544923319 in words is "twenty-one billion, five hundred forty-four million, nine hundred twenty-three thousand, three hundred nineteen".