121221200999 has 4 divisors (see below), whose sum is σ = 121222428600. Its totient is φ = 121219973400.

The previous prime is 121221200987. The next prime is 121221201001. The reversal of 121221200999 is 999002122121.

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 121221200999 - 2¹⁶ = 121221135463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221200929) 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, 451349 + ... + 667950.

It is an arithmetic number, because the mean of its divisors is an integer number (30305607150).

Almost surely, 2^121221200999 is an apocalyptic number.

121221200999 is a deficient number, since it is larger than the sum of its proper divisors (1227601).

121221200999 is a wasteful number, since it uses less digits than its factorization.

121221200999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227600.

The product of its (nonzero) digits is 11664, while the sum is 38.

It can be divided in two parts, 12122 and 1200999, that added together give a palindrome (1213121).

The spelling of 121221200999 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, nine hundred ninety-nine".