9100001021 has 4 divisors (see below), whose sum is σ = 9293618112. Its totient is φ = 8906383932.

The previous prime is 9100001011. The next prime is 9100001039. The reversal of 9100001021 is 1201000019.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201000019 = 43 ⋅27930233.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9100001021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9100000987 and 9100001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9100001011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96808475 + ... + 96808568.

It is an arithmetic number, because the mean of its divisors is an integer number (2323404528).

Almost surely, 2^9100001021 is an apocalyptic number.

It is an amenable number.

9100001021 is a deficient number, since it is larger than the sum of its proper divisors (193617091).

9100001021 is a wasteful number, since it uses less digits than its factorization.

9100001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193617090.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 9100001021 is about 95393.9254931885. The cubic root of 9100001021 is about 2087.7595567441.

The spelling of 9100001021 in words is "nine billion, one hundred million, one thousand, twenty-one".