121111111019 has 8 divisors (see below), whose sum is σ = 127489152000. Its totient is φ = 114733447272.

The previous prime is 121111111007. The next prime is 121111111021. The reversal of 121111111019 is 910111111121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121111111019 - 2²⁰ = 121110062443 is a prime.

It is a super-4 number, since 4×121111111019⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121111111049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 766022 + ... + 910500.

It is an arithmetic number, because the mean of its divisors is an integer number (15936144000).

Almost surely, 2^121111111019 is an apocalyptic number.

121111111019 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

121111111019 is a deficient number, since it is larger than the sum of its proper divisors (6378040981).

121111111019 is a wasteful number, since it uses less digits than its factorization.

121111111019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188617.

The product of its (nonzero) digits is 18, while the sum is 20.

The spelling of 121111111019 in words is "one hundred twenty-one billion, one hundred eleven million, one hundred eleven thousand, nineteen".