21455123119 has 2 divisors, whose sum is σ = 21455123120. Its totient is φ = 21455123118.

The previous prime is 21455123077. The next prime is 21455123149. The reversal of 21455123119 is 91132155412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21455123119 - 2²³ = 21446734511 is a prime.

It is a super-2 number, since 2×21455123119² (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 (21455123149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10727561559 + 10727561560.

It is an arithmetic number, because the mean of its divisors is an integer number (10727561560).

Almost surely, 2^21455123119 is an apocalyptic number.

21455123119 is a deficient number, since it is larger than the sum of its proper divisors (1).

21455123119 is an equidigital number, since it uses as much as digits as its factorization.

21455123119 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10800, while the sum is 34.

The spelling of 21455123119 in words is "twenty-one billion, four hundred fifty-five million, one hundred twenty-three thousand, one hundred nineteen".