1021211199979 has 2 divisors, whose sum is σ = 1021211199980. Its totient is φ = 1021211199978.

The previous prime is 1021211199913. The next prime is 1021211200001. The reversal of 1021211199979 is 9799911121201.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1021211199979 - 2⁷ = 1021211199851 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021211199779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510605599989 + 510605599990.

It is an arithmetic number, because the mean of its divisors is an integer number (510605599990).

Almost surely, 2^{1021211199979} is an apocalyptic number.

1021211199979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021211199979 is an equidigital number, since it uses as much as digits as its factorization.

1021211199979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 52.

The spelling of 1021211199979 in words is "one trillion, twenty-one billion, two hundred eleven million, one hundred ninety-nine thousand, nine hundred seventy-nine".