1000121021993 has 2 divisors, whose sum is σ = 1000121021994. Its totient is φ = 1000121021992.

The previous prime is 1000121021983. The next prime is 1000121022049. The reversal of 1000121021993 is 3991201210001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 537975307024 + 462145714969 = 733468^2 + 679813^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000121021993 - 2³⁸ = 725243115049 is a prime.

It is not a weakly prime, because it can be changed into another prime (1000121021953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500060510996 + 500060510997.

It is an arithmetic number, because the mean of its divisors is an integer number (500060510997).

Almost surely, 2^{1000121021993} is an apocalyptic number.

It is an amenable number.

1000121021993 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000121021993 is an equidigital number, since it uses as much as digits as its factorization.

1000121021993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 972, while the sum is 29.

Adding to 1000121021993 its reverse (3991201210001), we get a palindrome (4991322231994).

The spelling of 1000121021993 in words is "one trillion, one hundred twenty-one million, twenty-one thousand, nine hundred ninety-three".