212101121091 has 4 divisors (see below), whose sum is σ = 282801494792. Its totient is φ = 141400747392.

The previous prime is 212101121077. The next prime is 212101121131. The reversal of 212101121091 is 190121101212.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 212101121091 - 2¹⁵ = 212101088323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212101121041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35350186846 + ... + 35350186851.

It is an arithmetic number, because the mean of its divisors is an integer number (70700373698).

Almost surely, 2^212101121091 is an apocalyptic number.

212101121091 is a deficient number, since it is larger than the sum of its proper divisors (70700373701).

212101121091 is an equidigital number, since it uses as much as digits as its factorization.

212101121091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70700373700.

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

The spelling of 212101121091 in words is "two hundred twelve billion, one hundred one million, one hundred twenty-one thousand, ninety-one".