1021225918897 has 2 divisors, whose sum is σ = 1021225918898. Its totient is φ = 1021225918896.

The previous prime is 1021225918891. The next prime is 1021225918919. The reversal of 1021225918897 is 7988195221201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 594874380961 + 426351537936 = 771281^2 + 652956^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021225918897 - 2¹¹ = 1021225916849 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021225918891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510612959448 + 510612959449.

It is an arithmetic number, because the mean of its divisors is an integer number (510612959449).

Almost surely, 2^{1021225918897} is an apocalyptic number.

It is an amenable number.

1021225918897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021225918897 is an equidigital number, since it uses as much as digits as its factorization.

1021225918897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The spelling of 1021225918897 in words is "one trillion, twenty-one billion, two hundred twenty-five million, nine hundred eighteen thousand, eight hundred ninety-seven".