212021304091 has 2 divisors, whose sum is σ = 212021304092. Its totient is φ = 212021304090.

The previous prime is 212021304059. The next prime is 212021304101. The reversal of 212021304091 is 190403120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212021304091 - 2⁵ = 212021304059 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021304491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010652045 + 106010652046.

It is an arithmetic number, because the mean of its divisors is an integer number (106010652046).

Almost surely, 2^212021304091 is an apocalyptic number.

212021304091 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021304091 is an equidigital number, since it uses as much as digits as its factorization.

212021304091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The spelling of 212021304091 in words is "two hundred twelve billion, twenty-one million, three hundred four thousand, ninety-one".