921090099 has 16 divisors (see below), whose sum is σ = 1265339808. Its totient is φ = 595556352.

The previous prime is 921090097. The next prime is 921090187. The reversal of 921090099 is 990090129.

It is a happy number.

It is not a de Polignac number, because 921090099 - 2¹ = 921090097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (921090091) 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 15 ways as a sum of consecutive naturals, for example, 22099 + ... + 48275.

It is an arithmetic number, because the mean of its divisors is an integer number (79083738).

Almost surely, 2^921090099 is an apocalyptic number.

921090099 is a deficient number, since it is larger than the sum of its proper divisors (344249709).

921090099 is a wasteful number, since it uses less digits than its factorization.

921090099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26534.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 921090099 is about 30349.4662061790. The cubic root of 921090099 is about 972.9728115938.

The spelling of 921090099 in words is "nine hundred twenty-one million, ninety thousand, ninety-nine".