21350986 has 8 divisors (see below), whose sum is σ = 32279040. Its totient is φ = 10591308.

The previous prime is 21350933. The next prime is 21350999. The reversal of 21350986 is 68905312.

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, 41776 + ... + 42283.

It is an arithmetic number, because the mean of its divisors is an integer number (4034880).

Almost surely, 2^21350986 is an apocalyptic number.

21350986 is a deficient number, since it is larger than the sum of its proper divisors (10928054).

21350986 is a wasteful number, since it uses less digits than its factorization.

21350986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84188.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 21350986 is about 4620.7127155884. The cubic root of 21350986 is about 277.4209866217.

The spelling of 21350986 in words is "twenty-one million, three hundred fifty thousand, nine hundred eighty-six".