21200986 has 8 divisors (see below), whose sum is σ = 33184224. Its totient is φ = 10139580.

The previous prime is 21200983. The next prime is 21200987. The reversal of 21200986 is 68900212.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (21200983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230400 + ... + 230491.

It is an arithmetic number, because the mean of its divisors is an integer number (4148028).

Almost surely, 2^21200986 is an apocalyptic number.

21200986 is a deficient number, since it is larger than the sum of its proper divisors (11983238).

21200986 is a wasteful number, since it uses less digits than its factorization.

21200986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460916.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21200986 is about 4604.4528448014. The cubic root of 21200986 is about 276.7697913980.

The spelling of 21200986 in words is "twenty-one million, two hundred thousand, nine hundred eighty-six".