21552067 has 2 divisors, whose sum is σ = 21552068. Its totient is φ = 21552066.

The previous prime is 21552059. The next prime is 21552077. The reversal of 21552067 is 76025512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21552067 - 2³ = 21552059 is a prime.

It is a super-3 number, since 3×21552067³ (a number of 23 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21552007) by changing a digit.

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 as a sum of consecutive naturals, namely, 10776033 + 10776034.

It is an arithmetic number, because the mean of its divisors is an integer number (10776034).

Almost surely, 2^21552067 is an apocalyptic number.

21552067 is a deficient number, since it is larger than the sum of its proper divisors (1).

21552067 is an equidigital number, since it uses as much as digits as its factorization.

21552067 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 21552067 is about 4642.4203816544. The cubic root of 21552067 is about 278.2891725588.

Adding to 21552067 its reverse (76025512), we get a palindrome (97577579).

The spelling of 21552067 in words is "twenty-one million, five hundred fifty-two thousand, sixty-seven".