1021221848989 has 2 divisors, whose sum is σ = 1021221848990. Its totient is φ = 1021221848988.

The previous prime is 1021221848987. The next prime is 1021221849029. The reversal of 1021221848989 is 9898481221201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 984941123364 + 36280725625 = 992442^2 + 190475^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021221848989 - 2¹ = 1021221848987 is a prime.

Together with 1021221848987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021221848987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510610924494 + 510610924495.

It is an arithmetic number, because the mean of its divisors is an integer number (510610924495).

Almost surely, 2^{1021221848989} is an apocalyptic number.

It is an amenable number.

1021221848989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021221848989 is an equidigital number, since it uses as much as digits as its factorization.

1021221848989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1327104, while the sum is 55.

The spelling of 1021221848989 in words is "one trillion, twenty-one billion, two hundred twenty-one million, eight hundred forty-eight thousand, nine hundred eighty-nine".