21527231827 has 2 divisors, whose sum is σ = 21527231828. Its totient is φ = 21527231826.

The previous prime is 21527231821. The next prime is 21527231839. The reversal of 21527231827 is 72813272512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21527231827 - 2¹⁹ = 21526707539 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21527231827.

It is not a weakly prime, because it can be changed into another prime (21527231821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10763615913 + 10763615914.

It is an arithmetic number, because the mean of its divisors is an integer number (10763615914).

Almost surely, 2^21527231827 is an apocalyptic number.

21527231827 is a deficient number, since it is larger than the sum of its proper divisors (1).

21527231827 is an equidigital number, since it uses as much as digits as its factorization.

21527231827 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94080, while the sum is 40.

The spelling of 21527231827 in words is "twenty-one billion, five hundred twenty-seven million, two hundred thirty-one thousand, eight hundred twenty-seven".