21105674 has 8 divisors (see below), whose sum is σ = 33035040. Its totient is φ = 10093996.

The previous prime is 21105671. The next prime is 21105677. The reversal of 21105674 is 47650112.

It is an interprime number because it is at equal distance from previous prime (21105671) and next prime (21105677).

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21105671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229364 + ... + 229455.

It is an arithmetic number, because the mean of its divisors is an integer number (4129380).

Almost surely, 2^21105674 is an apocalyptic number.

21105674 is a deficient number, since it is larger than the sum of its proper divisors (11929366).

21105674 is a wasteful number, since it uses less digits than its factorization.

21105674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458844.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 21105674 is about 4594.0912050154. The cubic root of 21105674 is about 276.3544158698.

Adding to 21105674 its reverse (47650112), we get a palindrome (68755786).

The spelling of 21105674 in words is "twenty-one million, one hundred five thousand, six hundred seventy-four".