21049708 has 24 divisors (see below), whose sum is σ = 38606400. Its totient is φ = 10028928.

The previous prime is 21049703. The next prime is 21049709. The reversal of 21049708 is 80794012.

It is a self number, because there is not a number n which added to its sum of digits gives 21049708.

It is not an unprimeable number, because it can be changed into a prime (21049703) 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, 8016 + ... + 10312.

It is an arithmetic number, because the mean of its divisors is an integer number (1608600).

Almost surely, 2^21049708 is an apocalyptic number.

It is an amenable number.

21049708 is a deficient number, since it is larger than the sum of its proper divisors (17556692).

21049708 is a wasteful number, since it uses less digits than its factorization.

21049708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409 (or 2407 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 21049708 is about 4587.9960767202. The cubic root of 21049708 is about 276.1099296046.

The spelling of 21049708 in words is "twenty-one million, forty-nine thousand, seven hundred eight".