21748745238026 has 12 divisors (see below), whose sum is σ = 34655007551478. Its totient is φ = 10234703641152.

The previous prime is 21748745237977. The next prime is 21748745238079. The reversal of 21748745238026 is 62083254784712.

It is a Cunningham number, because it is equal to 4663555²+1.

It can be written as a sum of positive squares in 3 ways, for example, as 21748745238025 + 1 = 4663555^2 + 1^2 .

It is a super-2 number, since 2×21748745238026² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18813792881 + ... + 18813794036.

Almost surely, 2^{21748745238026} is an apocalyptic number.

21748745238026 is a deficient number, since it is larger than the sum of its proper divisors (12906262313452).

21748745238026 is a wasteful number, since it uses less digits than its factorization.

21748745238026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37627586953 (or 37627586936 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 59.

The spelling of 21748745238026 in words is "twenty-one trillion, seven hundred forty-eight billion, seven hundred forty-five million, two hundred thirty-eight thousand, twenty-six".