21891602 has 8 divisors (see below), whose sum is σ = 32863536. Its totient is φ = 10937092.

The previous prime is 21891599. The next prime is 21891637. The reversal of 21891602 is 20619812.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 548 + ... + 6639.

It is an arithmetic number, because the mean of its divisors is an integer number (4107942).

Almost surely, 2^21891602 is an apocalyptic number.

21891602 is a deficient number, since it is larger than the sum of its proper divisors (10971934).

21891602 is a wasteful number, since it uses less digits than its factorization.

21891602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8712.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 21891602 is about 4678.8462252996. The cubic root of 21891602 is about 279.7429699100.

The spelling of 21891602 in words is "twenty-one million, eight hundred ninety-one thousand, six hundred two".