1021100099 has 2 divisors, whose sum is σ = 1021100100. Its totient is φ = 1021100098.

The previous prime is 1021100089. The next prime is 1021100141. The reversal of 1021100099 is 9900011201.

It is a weak prime.

It is an emirp because it is prime and its reverse (9900011201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1021100099 - 2⁴ = 1021100083 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021100009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510550049 + 510550050.

It is an arithmetic number, because the mean of its divisors is an integer number (510550050).

Almost surely, 2^1021100099 is an apocalyptic number.

1021100099 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021100099 is an equidigital number, since it uses as much as digits as its factorization.

1021100099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 23.

The square root of 1021100099 is about 31954.6569219574. The cubic root of 1021100099 is about 1006.9844699390.

The spelling of 1021100099 in words is "one billion, twenty-one million, one hundred thousand, ninety-nine".