21006192 has 20 divisors (see below), whose sum is σ = 54266120. Its totient is φ = 7002048.

The previous prime is 21006163. The next prime is 21006217. The reversal of 21006192 is 29160012.

It is a congruent number.

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, 218767 + ... + 218862.

It is an arithmetic number, because the mean of its divisors is an integer number (2713306).

Almost surely, 2^21006192 is an apocalyptic number.

It is an amenable number.

21006192 is an abundant number, since it is smaller than the sum of its proper divisors (33259928).

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

21006192 is a wasteful number, since it uses less digits than its factorization.

21006192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437640 (or 437634 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 21006192 is about 4583.2512477498. The cubic root of 21006192 is about 275.9195312567.

The spelling of 21006192 in words is "twenty-one million, six thousand, one hundred ninety-two".