21647245149 has 12 divisors (see below), whose sum is σ = 32030883612. Its totient is φ = 14079508800.

The previous prime is 21647245079. The next prime is 21647245157. The reversal of 21647245149 is 94154274612.

21647245149 is a `hidden beast` number, since 2 + 1 + 64 + 72 + 4 + 514 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 384356025 + 21262889124 = 19605^2 + 145818^2 .

It is not a de Polignac number, because 21647245149 - 2⁷ = 21647245021 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21647245159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29331942 + ... + 29332679.

It is an arithmetic number, because the mean of its divisors is an integer number (2669240301).

Almost surely, 2^21647245149 is an apocalyptic number.

It is an amenable number.

21647245149 is a deficient number, since it is larger than the sum of its proper divisors (10383638463).

21647245149 is a wasteful number, since it uses less digits than its factorization.

21647245149 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58664668 (or 58664665 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The spelling of 21647245149 in words is "twenty-one billion, six hundred forty-seven million, two hundred forty-five thousand, one hundred forty-nine".