121993821479 has 2 divisors, whose sum is σ = 121993821480. Its totient is φ = 121993821478.

The previous prime is 121993821461. The next prime is 121993821503. The reversal of 121993821479 is 974128399121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121993821479 - 2¹² = 121993817383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121993821679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60996910739 + 60996910740.

It is an arithmetic number, because the mean of its divisors is an integer number (60996910740).

Almost surely, 2^121993821479 is an apocalyptic number.

121993821479 is a deficient number, since it is larger than the sum of its proper divisors (1).

121993821479 is an equidigital number, since it uses as much as digits as its factorization.

121993821479 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 56.

The spelling of 121993821479 in words is "one hundred twenty-one billion, nine hundred ninety-three million, eight hundred twenty-one thousand, four hundred seventy-nine".