1200100001221 has 8 divisors (see below), whose sum is σ = 1378105264800. Its totient is φ = 1033578948240.

The previous prime is 1200100001159. The next prime is 1200100001231. The reversal of 1200100001221 is 1221000010021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200100001221 - 2³³ = 1191510066629 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200100001198 and 1200100001207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200100001231) 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, 2871052426 + ... + 2871052843.

It is an arithmetic number, because the mean of its divisors is an integer number (172263158100).

Almost surely, 2^{1200100001221} is an apocalyptic number.

1200100001221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200100001221 is a deficient number, since it is larger than the sum of its proper divisors (178005263579).

1200100001221 is a wasteful number, since it uses less digits than its factorization.

1200100001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5742105299.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1200100001221 its reverse (1221000010021), we get a palindrome (2421100011242).

The spelling of 1200100001221 in words is "one trillion, two hundred billion, one hundred million, one thousand, two hundred twenty-one".