100021093 has 2 divisors, whose sum is σ = 100021094. Its totient is φ = 100021092.

The previous prime is 100021091. The next prime is 100021121. The reversal of 100021093 is 390120001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 99161764 + 859329 = 9958^2 + 927^2 .

It is an emirp because it is prime and its reverse (390120001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100021093 - 2¹ = 100021091 is a prime.

Together with 100021091, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100021091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50010546 + 50010547.

It is an arithmetic number, because the mean of its divisors is an integer number (50010547).

Almost surely, 2^100021093 is an apocalyptic number.

It is an amenable number.

100021093 is a deficient number, since it is larger than the sum of its proper divisors (1).

100021093 is an equidigital number, since it uses as much as digits as its factorization.

100021093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 100021093 is about 10001.0545943915. The cubic root of 100021093 is about 464.1915160781.

Adding to 100021093 its reverse (390120001), we get a palindrome (490141094).

The spelling of 100021093 in words is "one hundred million, twenty-one thousand, ninety-three".