121211220019 has 4 divisors (see below), whose sum is σ = 121212007344. Its totient is φ = 121210432696.

The previous prime is 121211220017. The next prime is 121211220049. The reversal of 121211220019 is 910022112121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 121211220019 - 2¹ = 121211220017 is a prime.

It is a super-2 number, since 2×121211220019² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (121211220017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78772 + ... + 498625.

It is an arithmetic number, because the mean of its divisors is an integer number (30303001836).

Almost surely, 2^121211220019 is an apocalyptic number.

121211220019 is a deficient number, since it is larger than the sum of its proper divisors (787325).

121211220019 is an equidigital number, since it uses as much as digits as its factorization.

121211220019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787324.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 121211220019 in words is "one hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, nineteen".