100009621 has 2 divisors, whose sum is σ = 100009622. Its totient is φ = 100009620.

The previous prime is 100009607. The next prime is 100009649. The reversal of 100009621 is 126900001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 91680625 + 8328996 = 9575^2 + 2886^2 .

It is an emirp because it is prime and its reverse (126900001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 100009621 - 2¹⁷ = 99878549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100009321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50004810 + 50004811.

It is an arithmetic number, because the mean of its divisors is an integer number (50004811).

Almost surely, 2^100009621 is an apocalyptic number.

It is an amenable number.

100009621 is a deficient number, since it is larger than the sum of its proper divisors (1).

100009621 is an equidigital number, since it uses as much as digits as its factorization.

100009621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 100009621 is about 10000.4810384301. The cubic root of 100009621 is about 464.1737684593.

Adding to 100009621 its reverse (126900001), we get a palindrome (226909622).

The spelling of 100009621 in words is "one hundred million, nine thousand, six hundred twenty-one".