121216021499 has 4 divisors (see below), whose sum is σ = 121248203664. Its totient is φ = 121183839336.

The previous prime is 121216021483. The next prime is 121216021523. The reversal of 121216021499 is 994120612121.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 121216021499 - 2⁴ = 121216021483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121216021429) 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, 16085432 + ... + 16092965.

It is an arithmetic number, because the mean of its divisors is an integer number (30312050916).

Almost surely, 2^121216021499 is an apocalyptic number.

121216021499 is a deficient number, since it is larger than the sum of its proper divisors (32182165).

121216021499 is an equidigital number, since it uses as much as digits as its factorization.

121216021499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32182164.

The product of its (nonzero) digits is 15552, while the sum is 38.

The spelling of 121216021499 in words is "one hundred twenty-one billion, two hundred sixteen million, twenty-one thousand, four hundred ninety-nine".