21095529049 has 9 divisors (see below), whose sum is σ = 24540879807. Its totient is φ = 18081010584.

The previous prime is 21095528989. The next prime is 21095529061. The reversal of 21095529049 is 94092559012.

The square root of 21095529049 is 145243.

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

It can be written as a sum of positive squares in only one way, i.e., 583560649 + 20511968400 = 24157^2 + 143220^2 .

It is not a de Polignac number, because 21095529049 - 2²⁹ = 20558658137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21095527049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1006327 + ... + 1027075.

It is an arithmetic number, because the mean of its divisors is an integer number (2726764423).

Almost surely, 2^21095529049 is an apocalyptic number.

21095529049 is the 145243-rd square number.

21095529049 is the 72622-nd centered octagonal number.

It is an amenable number.

21095529049 is a deficient number, since it is larger than the sum of its proper divisors (3445350758).

21095529049 is an frugal number, since it uses more digits than its factorization.

21095529049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41512 (or 20756 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 46.

The spelling of 21095529049 in words is "twenty-one billion, ninety-five million, five hundred twenty-nine thousand, forty-nine".