2102123091 has 8 divisors (see below), whose sum is σ = 2806606080. Its totient is φ = 1399527752.

The previous prime is 2102123063. The next prime is 2102123147. The reversal of 2102123091 is 1903212012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2102123091 - 2⁵ = 2102123059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2102123011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469311 + ... + 473768.

It is an arithmetic number, because the mean of its divisors is an integer number (350825760).

Almost surely, 2^2102123091 is an apocalyptic number.

2102123091 is a deficient number, since it is larger than the sum of its proper divisors (704482989).

2102123091 is an equidigital number, since it uses as much as digits as its factorization.

2102123091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943825.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 2102123091 is about 45848.9159195722. The cubic root of 2102123091 is about 1281.0105729855.

The spelling of 2102123091 in words is "two billion, one hundred two million, one hundred twenty-three thousand, ninety-one".