21706446 has 16 divisors (see below), whose sum is σ = 43462224. Its totient is φ = 7227264.

The previous prime is 21706441. The next prime is 21706463. The reversal of 21706446 is 64460712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21706441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6246 + ... + 9078.

It is an arithmetic number, because the mean of its divisors is an integer number (2716389).

Almost surely, 2^21706446 is an apocalyptic number.

21706446 is an abundant number, since it is smaller than the sum of its proper divisors (21755778).

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

21706446 is a wasteful number, since it uses less digits than its factorization.

21706446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4115.

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 21706446 is about 4659.0177076289. The cubic root of 21706446 is about 278.9520607244.

The spelling of 21706446 in words is "twenty-one million, seven hundred six thousand, four hundred forty-six".