21060747 has 12 divisors (see below), whose sum is σ = 31068960. Its totient is φ = 13741488.

The previous prime is 21060731. The next prime is 21060751. The reversal of 21060747 is 74706012.

21060747 is a `hidden beast` number, since 2 + 10 + 607 + 47 = 666.

It is not a de Polignac number, because 21060747 - 2⁴ = 21060731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21060747.

It is not an unprimeable number, because it can be changed into a prime (21060707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24472 + ... + 25317.

It is an arithmetic number, because the mean of its divisors is an integer number (2589080).

Almost surely, 2^21060747 is an apocalyptic number.

21060747 is a deficient number, since it is larger than the sum of its proper divisors (10008213).

21060747 is a wasteful number, since it uses less digits than its factorization.

21060747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49842 (or 49839 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21060747 is about 4589.1989497079. The cubic root of 21060747 is about 276.1581875164.

Adding to 21060747 its reverse (74706012), we get a palindrome (95766759).

The spelling of 21060747 in words is "twenty-one million, sixty thousand, seven hundred forty-seven".