21052446 has 8 divisors (see below), whose sum is σ = 42104904. Its totient is φ = 7017480.

The previous prime is 21052411. The next prime is 21052469. The reversal of 21052446 is 64425012.

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

21052446 is an admirable number.

It is a congruent 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, 1754365 + ... + 1754376.

It is an arithmetic number, because the mean of its divisors is an integer number (5263113).

Almost surely, 2^21052446 is an apocalyptic number.

21052446 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.

21052446 is a wasteful number, since it uses less digits than its factorization.

21052446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508746.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 21052446 is about 4588.2944543697. The cubic root of 21052446 is about 276.1219005737.

Adding to 21052446 its reverse (64425012), we get a palindrome (85477458).

The spelling of 21052446 in words is "twenty-one million, fifty-two thousand, four hundred forty-six".