21741706 has 16 divisors (see below), whose sum is σ = 38557440. Its totient is φ = 8996400.

The previous prime is 21741689. The next prime is 21741743. The reversal of 21741706 is 60714712.

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, 26370 + ... + 27181.

It is an arithmetic number, because the mean of its divisors is an integer number (2409840).

Almost surely, 2^21741706 is an apocalyptic number.

21741706 is a deficient number, since it is larger than the sum of its proper divisors (16815734).

21741706 is a wasteful number, since it uses less digits than its factorization.

21741706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53589.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21741706 is about 4662.8002316205. The cubic root of 21741706 is about 279.1030224659.

The spelling of 21741706 in words is "twenty-one million, seven hundred forty-one thousand, seven hundred six".