100000921 has 2 divisors, whose sum is σ = 100000922. Its totient is φ = 100000920.

The previous prime is 100000891. The next prime is 100000937. The reversal of 100000921 is 129000001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98010000 + 1990921 = 9900^2 + 1411^2 .

It is a cyclic number.

It is not a de Polignac number, because 100000921 - 2⁷ = 100000793 is a prime.

It is not a weakly prime, because it can be changed into another prime (100000421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50000460 + 50000461.

It is an arithmetic number, because the mean of its divisors is an integer number (50000461).

Almost surely, 2^100000921 is an apocalyptic number.

It is an amenable number.

100000921 is a deficient number, since it is larger than the sum of its proper divisors (1).

100000921 is an equidigital number, since it uses as much as digits as its factorization.

100000921 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 13.

The square root of 100000921 is about 10000.0460498940. The cubic root of 100000921 is about 464.1603083247.

Adding to 100000921 its reverse (129000001), we get a palindrome (229000922).

The spelling of 100000921 in words is "one hundred million, nine hundred twenty-one", and thus it is an aban number.