21047006 has 12 divisors (see below), whose sum is σ = 32451048. Its totient is φ = 10237752.

The previous prime is 21046997. The next prime is 21047017. The reversal of 21047006 is 60074012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1106 + ... + 6581.

It is an arithmetic number, because the mean of its divisors is an integer number (2704254).

Almost surely, 2^21047006 is an apocalyptic number.

21047006 is a deficient number, since it is larger than the sum of its proper divisors (11404042).

21047006 is an equidigital number, since it uses as much as digits as its factorization.

21047006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7763 (or 7726 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 21047006 is about 4587.7016031996. The cubic root of 21047006 is about 276.0981150155.

The spelling of 21047006 in words is "twenty-one million, forty-seven thousand, six".