12221121021999 has 8 divisors (see below), whose sum is σ = 17003298813312. Its totient is φ = 7793178622680.

The previous prime is 12221121021961. The next prime is 12221121022037. The reversal of 12221121021999 is 99912012112221.

It is an interprime number because it is at equal distance from previous prime (12221121021961) and next prime (12221121022037).

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

It is a de Polignac number, because none of the positive numbers 2^k-12221121021999 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12221121021999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221121021899) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88558847917 + ... + 88558848054.

It is an arithmetic number, because the mean of its divisors is an integer number (2125412351664).

Almost surely, 2^{12221121021999} is an apocalyptic number.

12221121021999 is a deficient number, since it is larger than the sum of its proper divisors (4782177791313).

12221121021999 is a wasteful number, since it uses less digits than its factorization.

12221121021999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177117695997.

The product of its (nonzero) digits is 23328, while the sum is 42.

The spelling of 12221121021999 in words is "twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, twenty-one thousand, nine hundred ninety-nine".