21003853250827 has 2 divisors, whose sum is σ = 21003853250828. Its totient is φ = 21003853250826.

The previous prime is 21003853250813. The next prime is 21003853250899. The reversal of 21003853250827 is 72805235830012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21003853250827 - 2¹⁵ = 21003853218059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21003853050827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501926625413 + 10501926625414.

It is an arithmetic number, because the mean of its divisors is an integer number (10501926625414).

Almost surely, 2^{21003853250827} is an apocalyptic number.

21003853250827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21003853250827 is an equidigital number, since it uses as much as digits as its factorization.

21003853250827 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 806400, while the sum is 46.

The spelling of 21003853250827 in words is "twenty-one trillion, three billion, eight hundred fifty-three million, two hundred fifty thousand, eight hundred twenty-seven".