21052054 has 8 divisors (see below), whose sum is σ = 31742280. Its totient is φ = 10471296.

The previous prime is 21052051. The next prime is 21052063. The reversal of 21052054 is 45025012.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21052051) by changing a digit.

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, 26884 + ... + 27655.

It is an arithmetic number, because the mean of its divisors is an integer number (3967785).

Almost surely, 2^21052054 is an apocalyptic number.

21052054 is a deficient number, since it is larger than the sum of its proper divisors (10690226).

21052054 is a wasteful number, since it uses less digits than its factorization.

21052054 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54734.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21052054 is about 4588.2517367730. The cubic root of 21052054 is about 276.1201867514.

Adding to 21052054 its reverse (45025012), we get a palindrome (66077066).

The spelling of 21052054 in words is "twenty-one million, fifty-two thousand, fifty-four".