21827580919 has 2 divisors, whose sum is σ = 21827580920. Its totient is φ = 21827580918.

The previous prime is 21827580889. The next prime is 21827580989. The reversal of 21827580919 is 91908572812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21827580919 - 2¹⁵ = 21827548151 is a prime.

It is a super-2 number, since 2×21827580919² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21827580989) 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, 10913790459 + 10913790460.

It is an arithmetic number, because the mean of its divisors is an integer number (10913790460).

Almost surely, 2^21827580919 is an apocalyptic number.

21827580919 is a deficient number, since it is larger than the sum of its proper divisors (1).

21827580919 is an equidigital number, since it uses as much as digits as its factorization.

21827580919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 52.

The spelling of 21827580919 in words is "twenty-one billion, eight hundred twenty-seven million, five hundred eighty thousand, nine hundred nineteen".