101212121221979 has 2 divisors, whose sum is σ = 101212121221980. Its totient is φ = 101212121221978.

The previous prime is 101212121221961. The next prime is 101212121221997. The reversal of 101212121221979 is 979122121212101.

Together with next prime (101212121221997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (101212121221961) and next prime (101212121221997).

It is a cyclic number.

It is not a de Polignac number, because 101212121221979 - 2⁸ = 101212121221723 is a prime.

It is not a weakly prime, because it can be changed into another prime (101212121221579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50606060610989 + 50606060610990.

It is an arithmetic number, because the mean of its divisors is an integer number (50606060610990).

Almost surely, 2^{101212121221979} is an apocalyptic number.

101212121221979 is a deficient number, since it is larger than the sum of its proper divisors (1).

101212121221979 is an equidigital number, since it uses as much as digits as its factorization.

101212121221979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 101212121221979 in words is "one hundred one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twenty-one thousand, nine hundred seventy-nine".