1001022121993 has 2 divisors, whose sum is σ = 1001022121994. Its totient is φ = 1001022121992.

The previous prime is 1001022121951. The next prime is 1001022122041. The reversal of 1001022121993 is 3991212201001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 745827413769 + 255194708224 = 863613^2 + 505168^2 .

It is an emirp because it is prime and its reverse (3991212201001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001022121993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1001022121943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500511060996 + 500511060997.

It is an arithmetic number, because the mean of its divisors is an integer number (500511060997).

Almost surely, 2^{1001022121993} is an apocalyptic number.

It is an amenable number.

1001022121993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1001022121993 is an equidigital number, since it uses as much as digits as its factorization.

1001022121993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 31.

Adding to 1001022121993 its reverse (3991212201001), we get a palindrome (4992234322994).

The spelling of 1001022121993 in words is "one trillion, one billion, twenty-two million, one hundred twenty-one thousand, nine hundred ninety-three".