21091346 has 8 divisors (see below), whose sum is σ = 32657664. Its totient is φ = 10205460.

The previous prime is 21091333. The next prime is 21091351. The reversal of 21091346 is 64319012.

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, 170030 + ... + 170153.

It is an arithmetic number, because the mean of its divisors is an integer number (4082208).

Almost surely, 2^21091346 is an apocalyptic number.

21091346 is a deficient number, since it is larger than the sum of its proper divisors (11566318).

21091346 is a wasteful number, since it uses less digits than its factorization.

21091346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340216.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21091346 is about 4592.5315458906. The cubic root of 21091346 is about 276.2918655113.

The spelling of 21091346 in words is "twenty-one million, ninety-one thousand, three hundred forty-six".