21159484369 has 3 divisors (see below), whose sum is σ = 21159629833. Its totient is φ = 21159338906.

The previous prime is 21159484237. The next prime is 21159484393. The reversal of 21159484369 is 96348495112.

The square root of 21159484369 is 145463.

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 21159484369 - 2²¹ = 21157387217 is a prime.

It is a super-2 number, since 2×21159484369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21159484669) 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, 72732 + ... + 218194.

Almost surely, 2^21159484369 is an apocalyptic number.

21159484369 is the 145463-rd square number.

21159484369 is the 72732-nd centered octagonal number.

It is an amenable number.

21159484369 is a deficient number, since it is larger than the sum of its proper divisors (145464).

21159484369 is an frugal number, since it uses more digits than its factorization.

21159484369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290926 (or 145463 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 52.

The spelling of 21159484369 in words is "twenty-one billion, one hundred fifty-nine million, four hundred eighty-four thousand, three hundred sixty-nine".