21046207 has 8 divisors (see below), whose sum is σ = 25903136. Its totient is φ = 16651872.

The previous prime is 21046171. The next prime is 21046217. The reversal of 21046207 is 70264012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21046207 - 2²³ = 12657599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21046217) 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, 115548 + ... + 115729.

It is an arithmetic number, because the mean of its divisors is an integer number (3237892).

Almost surely, 2^21046207 is an apocalyptic number.

21046207 is a deficient number, since it is larger than the sum of its proper divisors (4856929).

21046207 is a wasteful number, since it uses less digits than its factorization.

21046207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231297.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21046207 is about 4587.6145217313. The cubic root of 21046207 is about 276.0946211665.

The spelling of 21046207 in words is "twenty-one million, forty-six thousand, two hundred seven".