21097627 has 2 divisors, whose sum is σ = 21097628. Its totient is φ = 21097626.

The previous prime is 21097613. The next prime is 21097631. The reversal of 21097627 is 72679012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21097627 - 2¹¹ = 21095579 is a prime.

It is a super-2 number, since 2×21097627² = 890219730062258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21097592 and 21097601.

It is not a weakly prime, because it can be changed into another prime (21097667) 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, 10548813 + 10548814.

It is an arithmetic number, because the mean of its divisors is an integer number (10548814).

Almost surely, 2^21097627 is an apocalyptic number.

21097627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21097627 is an equidigital number, since it uses as much as digits as its factorization.

21097627 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 21097627 is about 4593.2153226253. The cubic root of 21097627 is about 276.3192893493.

The spelling of 21097627 in words is "twenty-one million, ninety-seven thousand, six hundred twenty-seven".