21628627 has 2 divisors, whose sum is σ = 21628628. Its totient is φ = 21628626.

The previous prime is 21628603. The next prime is 21628643. The reversal of 21628627 is 72682612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21628627 - 2¹⁵ = 21595859 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21628592 and 21628601.

It is not a weakly prime, because it can be changed into another prime (21628657) 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 as a sum of consecutive naturals, namely, 10814313 + 10814314.

It is an arithmetic number, because the mean of its divisors is an integer number (10814314).

Almost surely, 2^21628627 is an apocalyptic number.

21628627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21628627 is an equidigital number, since it uses as much as digits as its factorization.

21628627 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 21628627 is about 4650.6587705399. The cubic root of 21628627 is about 278.6183078927.

The spelling of 21628627 in words is "twenty-one million, six hundred twenty-eight thousand, six hundred twenty-seven".