2121210011091 has 16 divisors (see below), whose sum is σ = 2841842768544. Its totient is φ = 1407364717824.

The previous prime is 2121210011077. The next prime is 2121210011093. The reversal of 2121210011091 is 1901100121212.

It is not a de Polignac number, because 2121210011091 - 2⁷ = 2121210010963 is a prime.

It is a super-3 number, since 3×2121210011091³ (a number of 38 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2121210011093) 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, 636105 + ... + 2155701.

It is an arithmetic number, because the mean of its divisors is an integer number (177615173034).

Almost surely, 2^{2121210011091} is an apocalyptic number.

2121210011091 is a deficient number, since it is larger than the sum of its proper divisors (720632757453).

2121210011091 is a wasteful number, since it uses less digits than its factorization.

2121210011091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521830.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 2121210011091 in words is "two trillion, one hundred twenty-one billion, two hundred ten million, eleven thousand, ninety-one".