100020121489 has 2 divisors, whose sum is σ = 100020121490. Its totient is φ = 100020121488.

The previous prime is 100020121463. The next prime is 100020121507. The reversal of 100020121489 is 984121020001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99688590225 + 331531264 = 315735^2 + 18208^2 .

It is a cyclic number.

It is not a de Polignac number, because 100020121489 - 2¹⁷ = 100019990417 is a prime.

It is not a weakly prime, because it can be changed into another prime (100020121889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010060744 + 50010060745.

It is an arithmetic number, because the mean of its divisors is an integer number (50010060745).

Almost surely, 2^100020121489 is an apocalyptic number.

It is an amenable number.

100020121489 is a deficient number, since it is larger than the sum of its proper divisors (1).

100020121489 is an equidigital number, since it uses as much as digits as its factorization.

100020121489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 100020121489 in words is "one hundred billion, twenty million, one hundred twenty-one thousand, four hundred eighty-nine".