100000091921 has 4 divisors (see below), whose sum is σ = 100001625600. Its totient is φ = 99998558244.

The previous prime is 100000091887. The next prime is 100000091959. The reversal of 100000091921 is 129190000001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100000091921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100000091221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 664481 + ... + 800958.

It is an arithmetic number, because the mean of its divisors is an integer number (25000406400).

Almost surely, 2^100000091921 is an apocalyptic number.

It is an amenable number.

100000091921 is a deficient number, since it is larger than the sum of its proper divisors (1533679).

100000091921 is an equidigital number, since it uses as much as digits as its factorization.

100000091921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533678.

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

Adding to 100000091921 its reverse (129190000001), we get a palindrome (229190091922).

The spelling of 100000091921 in words is "one hundred billion, ninety-one thousand, nine hundred twenty-one".