100019111021 has 2 divisors, whose sum is σ = 100019111022. Its totient is φ = 100019111020.

The previous prime is 100019111009. The next prime is 100019111081. The reversal of 100019111021 is 120111910001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86310213796 + 13708897225 = 293786^2 + 117085^2 .

It is an emirp because it is prime and its reverse (120111910001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100019111021 - 2¹⁰ = 100019109997 is a prime.

It is a super-2 number, since 2×100019111021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100019111081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50009555510 + 50009555511.

It is an arithmetic number, because the mean of its divisors is an integer number (50009555511).

Almost surely, 2^100019111021 is an apocalyptic number.

It is an amenable number.

100019111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100019111021 is an equidigital number, since it uses as much as digits as its factorization.

100019111021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 17.

The spelling of 100019111021 in words is "one hundred billion, nineteen million, one hundred eleven thousand, twenty-one".