21745802 has 8 divisors (see below), whose sum is σ = 35127876. Its totient is φ = 10036512.

The previous prime is 21745799. The next prime is 21745901. The reversal of 21745802 is 20854712.

It can be written as a sum of positive squares in 2 ways, for example, as 17986081 + 3759721 = 4241^2 + 1939^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 418163 + ... + 418214.

Almost surely, 2^21745802 is an apocalyptic number.

21745802 is a deficient number, since it is larger than the sum of its proper divisors (13382074).

21745802 is a wasteful number, since it uses less digits than its factorization.

21745802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836392.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 21745802 is about 4663.2394319829. The cubic root of 21745802 is about 279.1205484472.

The spelling of 21745802 in words is "twenty-one million, seven hundred forty-five thousand, eight hundred two".