121000019 has 4 divisors (see below), whose sum is σ = 138285744. Its totient is φ = 103714296.

The previous prime is 121000003. The next prime is 121000049. The reversal of 121000019 is 910000121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121000019 - 2⁴ = 121000003 is a prime.

It is a super-2 number, since 2×121000019² = 29282009196000722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120999967 and 121000012.

It is not an unprimeable number, because it can be changed into a prime (121000049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8642852 + ... + 8642865.

It is an arithmetic number, because the mean of its divisors is an integer number (34571436).

Almost surely, 2^121000019 is an apocalyptic number.

121000019 is a deficient number, since it is larger than the sum of its proper divisors (17285725).

121000019 is an equidigital number, since it uses as much as digits as its factorization.

121000019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17285724.

The product of its (nonzero) digits is 18, while the sum is 14.

The square root of 121000019 is about 11000.0008636363. Note that the first 3 decimals coincide. The cubic root of 121000019 is about 494.6087702135.

The spelling of 121000019 in words is "one hundred twenty-one million, nineteen", and thus it is an aban number.