21259627 has 2 divisors, whose sum is σ = 21259628. Its totient is φ = 21259626.

The previous prime is 21259603. The next prime is 21259657. The reversal of 21259627 is 72695212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21259627 - 2¹⁹ = 20735339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21259592 and 21259601.

It is not a weakly prime, because it can be changed into another prime (21259657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10629813 + 10629814.

It is an arithmetic number, because the mean of its divisors is an integer number (10629814).

Almost surely, 2^21259627 is an apocalyptic number.

21259627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21259627 is an equidigital number, since it uses as much as digits as its factorization.

21259627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15120, while the sum is 34.

The square root of 21259627 is about 4610.8163051677. The cubic root of 21259627 is about 277.0247342013.

The spelling of 21259627 in words is "twenty-one million, two hundred fifty-nine thousand, six hundred twenty-seven".