21455242374344 has 16 divisors (see below), whose sum is σ = 40288354468620. Its totient is φ = 10711681182720.

The previous prime is 21455242374317. The next prime is 21455242374373. The reversal of 21455242374344 is 44347324255412.

It can be written as a sum of positive squares in 2 ways, for example, as 18657751969444 + 2797490404900 = 4319462^2 + 1672570^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21455242374292 and 21455242374301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1992494837 + ... + 1992505604.

Almost surely, 2^{21455242374344} is an apocalyptic number.

It is an amenable number.

21455242374344 is a deficient number, since it is larger than the sum of its proper divisors (18833112094276).

21455242374344 is a wasteful number, since it uses less digits than its factorization.

21455242374344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985001120 (or 3985001116 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 50.

The spelling of 21455242374344 in words is "twenty-one trillion, four hundred fifty-five billion, two hundred forty-two million, three hundred seventy-four thousand, three hundred forty-four".