121019819 has 4 divisors (see below), whose sum is σ = 122267544. Its totient is φ = 119772096.

The previous prime is 121019807. The next prime is 121019831. The reversal of 121019819 is 918910121.

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

It is an interprime number because it is at equal distance from previous prime (121019807) and next prime (121019831).

It is a cyclic number.

It is not a de Polignac number, because 121019819 - 2⁴ = 121019803 is a prime.

It is a super-2 number, since 2×121019819² = 29291593181585522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121019849) 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 in 3 ways as a sum of consecutive naturals, for example, 623717 + ... + 623910.

It is an arithmetic number, because the mean of its divisors is an integer number (30566886).

Almost surely, 2^121019819 is an apocalyptic number.

121019819 is a deficient number, since it is larger than the sum of its proper divisors (1247725).

121019819 is an equidigital number, since it uses as much as digits as its factorization.

121019819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247724.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 121019819 is about 11000.9008267505. The cubic root of 121019819 is about 494.6357473980.

The spelling of 121019819 in words is "one hundred twenty-one million, nineteen thousand, eight hundred nineteen".