21296547 has 8 divisors (see below), whose sum is σ = 31550480. Its totient is φ = 14197680.

The previous prime is 21296537. The next prime is 21296617. The reversal of 21296547 is 74569212.

21296547 is a `hidden beast` number, since 21 + 2 + 96 + 547 = 666.

It is not a de Polignac number, because 21296547 - 2¹⁴ = 21280163 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21296537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394354 + ... + 394407.

It is an arithmetic number, because the mean of its divisors is an integer number (3943810).

Almost surely, 2^21296547 is an apocalyptic number.

21296547 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

21296547 is a deficient number, since it is larger than the sum of its proper divisors (10253933).

21296547 is an equidigital number, since it uses as much as digits as its factorization.

21296547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788770 (or 788764 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 21296547 is about 4614.8181979359. The cubic root of 21296547 is about 277.1850041549.

The spelling of 21296547 in words is "twenty-one million, two hundred ninety-six thousand, five hundred forty-seven".