21831346 has 8 divisors (see below), whose sum is σ = 32841900. Its totient is φ = 10884048.

The previous prime is 21831263. The next prime is 21831353. The reversal of 21831346 is 64313812.

It can be written as a sum of positive squares in 2 ways, for example, as 21261321 + 570025 = 4611^2 + 755^2 .

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14941 + ... + 16336.

Almost surely, 2^21831346 is an apocalyptic number.

21831346 is a deficient number, since it is larger than the sum of its proper divisors (11010554).

21831346 is a wasteful number, since it uses less digits than its factorization.

21831346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31628.

The product of its digits is 3456, while the sum is 28.

The square root of 21831346 is about 4672.4025939553. The cubic root of 21831346 is about 279.4860725926.

The spelling of 21831346 in words is "twenty-one million, eight hundred thirty-one thousand, three hundred forty-six".