21046206 has 16 divisors (see below), whose sum is σ = 42151824. Its totient is φ = 7005504.

The previous prime is 21046171. The next prime is 21046217. The reversal of 21046206 is 60264012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3096 + ... + 7188.

It is an arithmetic number, because the mean of its divisors is an integer number (2634489).

Almost surely, 2^21046206 is an apocalyptic number.

21046206 is an abundant number, since it is smaller than the sum of its proper divisors (21105618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21046206 is a wasteful number, since it uses less digits than its factorization.

21046206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4955.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21046206 is about 4587.6144127422. The cubic root of 21046206 is about 276.0946167936.

The spelling of 21046206 in words is "twenty-one million, forty-six thousand, two hundred six".