21052067 has 8 divisors (see below), whose sum is σ = 21357024. Its totient is φ = 20749248.

The previous prime is 21052063. The next prime is 21052079. The reversal of 21052067 is 76025012.

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

It is a cyclic number.

It is not a de Polignac number, because 21052067 - 2² = 21052063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21052063) 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 7 ways as a sum of consecutive naturals, for example, 31913 + ... + 32565.

It is an arithmetic number, because the mean of its divisors is an integer number (2669628).

Almost surely, 2^21052067 is an apocalyptic number.

21052067 is a deficient number, since it is larger than the sum of its proper divisors (304957).

21052067 is a wasteful number, since it uses less digits than its factorization.

21052067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21052067 is about 4588.2531534343. The cubic root of 21052067 is about 276.1202435877.

Adding to 21052067 its reverse (76025012), we get a palindrome (97077079).

The spelling of 21052067 in words is "twenty-one million, fifty-two thousand, sixty-seven".