212021199979 has 2 divisors, whose sum is σ = 212021199980. Its totient is φ = 212021199978.

The previous prime is 212021199961. The next prime is 212021200031. The reversal of 212021199979 is 979991120212.

It is an a-pointer prime, because the next prime (212021200031) can be obtained adding 212021199979 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 212021199979 - 2¹⁷ = 212021068907 is a prime.

It is not a weakly prime, because it can be changed into another prime (212021199959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106010599989 + 106010599990.

It is an arithmetic number, because the mean of its divisors is an integer number (106010599990).

Almost surely, 2^212021199979 is an apocalyptic number.

212021199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

212021199979 is an equidigital number, since it uses as much as digits as its factorization.

212021199979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 367416, while the sum is 52.

The spelling of 212021199979 in words is "two hundred twelve billion, twenty-one million, one hundred ninety-nine thousand, nine hundred seventy-nine".