21047675 has 12 divisors (see below), whose sum is σ = 28472136. Its totient is φ = 15307200.

The previous prime is 21047671. The next prime is 21047713. The reversal of 21047675 is 57674012.

It is not a de Polignac number, because 21047675 - 2² = 21047671 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21047671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37994 + ... + 38543.

It is an arithmetic number, because the mean of its divisors is an integer number (2372678).

Almost surely, 2^21047675 is an apocalyptic number.

21047675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21047675 is a deficient number, since it is larger than the sum of its proper divisors (7424461).

21047675 is a wasteful number, since it uses less digits than its factorization.

21047675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76558 (or 76553 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 21047675 is about 4587.7745149473. The cubic root of 21047675 is about 276.1010403355.

It can be divided in two parts, 2104 and 7675, that added together give a palindrome (9779).

The spelling of 21047675 in words is "twenty-one million, forty-seven thousand, six hundred seventy-five".