121216020019 has 2 divisors, whose sum is σ = 121216020020. Its totient is φ = 121216020018.

The previous prime is 121216019941. The next prime is 121216020049. The reversal of 121216020019 is 910020612121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121216020019 - 2¹⁵ = 121215987251 is a prime.

It is a super-2 number, since 2×121216020019² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121216019975 and 121216020002.

It is not a weakly prime, because it can be changed into another prime (121216020049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60608010009 + 60608010010.

It is an arithmetic number, because the mean of its divisors is an integer number (60608010010).

Almost surely, 2^121216020019 is an apocalyptic number.

121216020019 is a deficient number, since it is larger than the sum of its proper divisors (1).

121216020019 is an equidigital number, since it uses as much as digits as its factorization.

121216020019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The spelling of 121216020019 in words is "one hundred twenty-one billion, two hundred sixteen million, twenty thousand, nineteen".