21666035125627 has 2 divisors, whose sum is σ = 21666035125628. Its totient is φ = 21666035125626.

The previous prime is 21666035125601. The next prime is 21666035125661. The reversal of 21666035125627 is 72652153066612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21666035125627 - 2¹⁹ = 21666034601339 is a prime.

It is not a weakly prime, because it can be changed into another prime (21666035125727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10833017562813 + 10833017562814.

It is an arithmetic number, because the mean of its divisors is an integer number (10833017562814).

Almost surely, 2^{21666035125627} is an apocalyptic number.

21666035125627 is a deficient number, since it is larger than the sum of its proper divisors (1).

21666035125627 is an equidigital number, since it uses as much as digits as its factorization.

21666035125627 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5443200, while the sum is 52.

The spelling of 21666035125627 in words is "twenty-one trillion, six hundred sixty-six billion, thirty-five million, one hundred twenty-five thousand, six hundred twenty-seven".