21748297539049 has 3 divisors (see below), whose sum is σ = 21748302202557. Its totient is φ = 21748292875542.

The previous prime is 21748297539041. The next prime is 21748297539077. The reversal of 21748297539049 is 94093579284712.

The square root of 21748297539049 is 4663507.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 21748297539049 - 2³ = 21748297539041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21748297539041) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2331754 + ... + 6995260.

It is an arithmetic number, because the mean of its divisors is an integer number (7249434067519).

Almost surely, 2^{21748297539049} is an apocalyptic number.

21748297539049 is the 4663507-th square number.

21748297539049 is the 2331754-th centered octagonal number.

It is an amenable number.

21748297539049 is a deficient number, since it is larger than the sum of its proper divisors (4663508).

21748297539049 is an frugal number, since it uses more digits than its factorization.

21748297539049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9327014 (or 4663507 counting only the distinct ones).

The product of its (nonzero) digits is 274337280, while the sum is 70.

The spelling of 21748297539049 in words is "twenty-one trillion, seven hundred forty-eight billion, two hundred ninety-seven million, five hundred thirty-nine thousand, forty-nine".