21552296149 has 4 divisors (see below), whose sum is σ = 21582695020. Its totient is φ = 21521897280.

The previous prime is 21552296081. The next prime is 21552296153. The reversal of 21552296149 is 94169225512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2879073649 + 18673222500 = 53657^2 + 136650^2 .

It is a cyclic number.

It is not a de Polignac number, because 21552296149 - 2¹⁷ = 21552165077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21552296099 and 21552296108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21552296449) 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 3 ways as a sum of consecutive naturals, for example, 15198372 + ... + 15199789.

It is an arithmetic number, because the mean of its divisors is an integer number (5395673755).

Almost surely, 2^21552296149 is an apocalyptic number.

It is an amenable number.

21552296149 is a deficient number, since it is larger than the sum of its proper divisors (30398871).

21552296149 is an equidigital number, since it uses as much as digits as its factorization.

21552296149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30398870.

The product of its digits is 388800, while the sum is 46.

The spelling of 21552296149 in words is "twenty-one billion, five hundred fifty-two million, two hundred ninety-six thousand, one hundred forty-nine".