100120621889 has 2 divisors, whose sum is σ = 100120621890. Its totient is φ = 100120621888.

The previous prime is 100120621837. The next prime is 100120621901. The reversal of 100120621889 is 988126021001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73189186225 + 26931435664 = 270535^2 + 164108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100120621889 is a prime.

It is not a weakly prime, because it can be changed into another prime (100120641889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50060310944 + 50060310945.

It is an arithmetic number, because the mean of its divisors is an integer number (50060310945).

Almost surely, 2^100120621889 is an apocalyptic number.

It is an amenable number.

100120621889 is a deficient number, since it is larger than the sum of its proper divisors (1).

100120621889 is an equidigital number, since it uses as much as digits as its factorization.

100120621889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 38.

The spelling of 100120621889 in words is "one hundred billion, one hundred twenty million, six hundred twenty-one thousand, eight hundred eighty-nine".