121821342719 has 2 divisors, whose sum is σ = 121821342720. Its totient is φ = 121821342718.

The previous prime is 121821342653. The next prime is 121821342733. The reversal of 121821342719 is 917243128121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121821342719 - 2¹² = 121821338623 is a prime.

It is a super-2 number, since 2×121821342719² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121821345719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60910671359 + 60910671360.

It is an arithmetic number, because the mean of its divisors is an integer number (60910671360).

Almost surely, 2^121821342719 is an apocalyptic number.

121821342719 is a deficient number, since it is larger than the sum of its proper divisors (1).

121821342719 is an equidigital number, since it uses as much as digits as its factorization.

121821342719 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The spelling of 121821342719 in words is "one hundred twenty-one billion, eight hundred twenty-one million, three hundred forty-two thousand, seven hundred nineteen".