21985853107 has 2 divisors, whose sum is σ = 21985853108. Its totient is φ = 21985853106.

The previous prime is 21985853083. The next prime is 21985853159. The reversal of 21985853107 is 70135858912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21985853107 - 2¹¹ = 21985851059 is a prime.

It is not a weakly prime, because it can be changed into another prime (21985853807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10992926553 + 10992926554.

It is an arithmetic number, because the mean of its divisors is an integer number (10992926554).

Almost surely, 2^21985853107 is an apocalyptic number.

21985853107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21985853107 is an equidigital number, since it uses as much as digits as its factorization.

21985853107 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 49.

The spelling of 21985853107 in words is "twenty-one billion, nine hundred eighty-five million, eight hundred fifty-three thousand, one hundred seven".