212021304491 has 2 divisors, whose sum is σ = 212021304492. Its totient is φ = 212021304490.

The previous prime is 212021304349. The next prime is 212021304503. The reversal of 212021304491 is 194403120212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 212021304491 - 2¹⁰ = 212021303467 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021304091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010652245 + 106010652246.

It is an arithmetic number, because the mean of its divisors is an integer number (106010652246).

Almost surely, 2^212021304491 is an apocalyptic number.

212021304491 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021304491 is an equidigital number, since it uses as much as digits as its factorization.

212021304491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The spelling of 212021304491 in words is "two hundred twelve billion, twenty-one million, three hundred four thousand, four hundred ninety-one".