212021321801 has 2 divisors, whose sum is σ = 212021321802. Its totient is φ = 212021321800.

The previous prime is 212021321789. The next prime is 212021321807. The reversal of 212021321801 is 108123120212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212009598025 + 11723776 = 460445^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 212021321801 - 2⁶ = 212021321737 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021321807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010660900 + 106010660901.

It is an arithmetic number, because the mean of its divisors is an integer number (106010660901).

Almost surely, 2^212021321801 is an apocalyptic number.

It is an amenable number.

212021321801 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021321801 is an equidigital number, since it uses as much as digits as its factorization.

212021321801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 23.

The spelling of 212021321801 in words is "two hundred twelve billion, twenty-one million, three hundred twenty-one thousand, eight hundred one".