21149346 has 8 divisors (see below), whose sum is σ = 42298704. Its totient is φ = 7049780.

The previous prime is 21149333. The next prime is 21149353. The reversal of 21149346 is 64394112.

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

21149346 is an admirable number.

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, 1762440 + ... + 1762451.

It is an arithmetic number, because the mean of its divisors is an integer number (5287338).

Almost surely, 2^21149346 is an apocalyptic number.

21149346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21149346 is a wasteful number, since it uses less digits than its factorization.

21149346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3524896.

The product of its digits is 5184, while the sum is 30.

The square root of 21149346 is about 4598.8418107171. The cubic root of 21149346 is about 276.5448960099.

The spelling of 21149346 in words is "twenty-one million, one hundred forty-nine thousand, three hundred forty-six".