2091819121 has 16 divisors (see below), whose sum is σ = 2413845504. Its totient is φ = 1775672784.

The previous prime is 2091819073. The next prime is 2091819133. The reversal of 2091819121 is 1219181902.

It is a cyclic number.

It is not a de Polignac number, because 2091819121 - 2¹⁹ = 2091294833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2091819721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 327666 + ... + 333988.

It is an arithmetic number, because the mean of its divisors is an integer number (150865344).

Almost surely, 2^2091819121 is an apocalyptic number.

It is an amenable number.

2091819121 is a deficient number, since it is larger than the sum of its proper divisors (322026383).

2091819121 is a wasteful number, since it uses less digits than its factorization.

2091819121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6780.

The product of its (nonzero) digits is 2592, while the sum is 34.

The square root of 2091819121 is about 45736.4091397652. The cubic root of 2091819121 is about 1278.9141020204.

The spelling of 2091819121 in words is "two billion, ninety-one million, eight hundred nineteen thousand, one hundred twenty-one".