121020019 has 2 divisors, whose sum is σ = 121020020. Its totient is φ = 121020018.

The previous prime is 121019999. The next prime is 121020061. The reversal of 121020019 is 910020121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121020019 - 2⁷ = 121019891 is a prime.

It is a super-2 number, since 2×121020019² = 29291689997520722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121019984 and 121020011.

It is not a weakly prime, because it can be changed into another prime (121020919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510009 + 60510010.

It is an arithmetic number, because the mean of its divisors is an integer number (60510010).

Almost surely, 2^121020019 is an apocalyptic number.

121020019 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020019 is an equidigital number, since it uses as much as digits as its factorization.

121020019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 121020019 is about 11000.9099169114. The cubic root of 121020019 is about 494.6360198798.

The spelling of 121020019 in words is "one hundred twenty-one million, twenty thousand, nineteen".