22021019985697 has 2 divisors, whose sum is σ = 22021019985698. Its totient is φ = 22021019985696.

The previous prime is 22021019985691. The next prime is 22021019985751. The reversal of 22021019985697 is 79658991012022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19093194419776 + 2927825565921 = 4369576^2 + 1711089^2 .

It is a cyclic number.

It is not a de Polignac number, because 22021019985697 - 2¹⁹ = 22021019461409 is a prime.

It is not a weakly prime, because it can be changed into another prime (22021019985691) 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, 11010509992848 + 11010509992849.

It is an arithmetic number, because the mean of its divisors is an integer number (11010509992849).

Almost surely, 2^{22021019985697} is an apocalyptic number.

It is an amenable number.

22021019985697 is a deficient number, since it is larger than the sum of its proper divisors (1).

22021019985697 is an equidigital number, since it uses as much as digits as its factorization.

22021019985697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9797760, while the sum is 61.

The spelling of 22021019985697 in words is "twenty-two trillion, twenty-one billion, nineteen million, nine hundred eighty-five thousand, six hundred ninety-seven".