212001022091 has 2 divisors, whose sum is σ = 212001022092. Its totient is φ = 212001022090.

The previous prime is 212001022087. The next prime is 212001022139. The reversal of 212001022091 is 190220100212.

It is a happy number.

212001022091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212001022091 - 2² = 212001022087 is a prime.

It is not a weakly prime, because it can be changed into another prime (212001022591) 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 as a sum of consecutive naturals, namely, 106000511045 + 106000511046.

It is an arithmetic number, because the mean of its divisors is an integer number (106000511046).

Almost surely, 2^212001022091 is an apocalyptic number.

212001022091 is a deficient number, since it is larger than the sum of its proper divisors (1).

212001022091 is an equidigital number, since it uses as much as digits as its factorization.

212001022091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 212001022091 in words is "two hundred twelve billion, one million, twenty-two thousand, ninety-one".