212020300091 has 4 divisors (see below), whose sum is σ = 221238574032. Its totient is φ = 202802026152.

The previous prime is 212020300061. The next prime is 212020300117. The reversal of 212020300091 is 190003020212.

212020300091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212020300091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (212020300061) 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 3 ways as a sum of consecutive naturals, for example, 4609136936 + ... + 4609136981.

It is an arithmetic number, because the mean of its divisors is an integer number (55309643508).

Almost surely, 2^212020300091 is an apocalyptic number.

212020300091 is a deficient number, since it is larger than the sum of its proper divisors (9218273941).

212020300091 is an equidigital number, since it uses as much as digits as its factorization.

212020300091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9218273940.

The product of its (nonzero) digits is 216, while the sum is 20.

The spelling of 212020300091 in words is "two hundred twelve billion, twenty million, three hundred thousand, ninety-one".