121819601647 has 2 divisors, whose sum is σ = 121819601648. Its totient is φ = 121819601646.

The previous prime is 121819601621. The next prime is 121819601671. The reversal of 121819601647 is 746106918121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121819601647 - 2³⁵ = 87459863279 is a prime.

It is a super-2 number, since 2×121819601647² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121819601597 and 121819601606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121819661647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60909800823 + 60909800824.

It is an arithmetic number, because the mean of its divisors is an integer number (60909800824).

Almost surely, 2^121819601647 is an apocalyptic number.

121819601647 is a deficient number, since it is larger than the sum of its proper divisors (1).

121819601647 is an equidigital number, since it uses as much as digits as its factorization.

121819601647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 121819601647 in words is "one hundred twenty-one billion, eight hundred nineteen million, six hundred one thousand, six hundred forty-seven".