121221019 has 2 divisors, whose sum is σ = 121221020. Its totient is φ = 121221018.

The previous prime is 121221013. The next prime is 121221029. The reversal of 121221019 is 910122121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121221019 - 2⁹ = 121220507 is a prime.

It is a super-2 number, since 2×121221019² = 29389070894796722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 121220987 and 121221005.

It is not a weakly prime, because it can be changed into another prime (121221013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610509 + 60610510.

It is an arithmetic number, because the mean of its divisors is an integer number (60610510).

Almost surely, 2^121221019 is an apocalyptic number.

121221019 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221019 is an equidigital number, since it uses as much as digits as its factorization.

121221019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 121221019 is about 11010.0417347075. The cubic root of 121221019 is about 494.9097124719.

The spelling of 121221019 in words is "one hundred twenty-one million, two hundred twenty-one thousand, nineteen".