1200111012221 has 4 divisors (see below), whose sum is σ = 1309212013344. Its totient is φ = 1091010011100.

The previous prime is 1200111012211. The next prime is 1200111012223. The reversal of 1200111012221 is 1222101110021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200111012221 is a prime.

It is a super-2 number, since 2×1200111012221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1200111012196 and 1200111012205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200111012223) 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, 54550500545 + ... + 54550500566.

It is an arithmetic number, because the mean of its divisors is an integer number (327303003336).

Almost surely, 2^{1200111012221} is an apocalyptic number.

1200111012221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200111012221 is a deficient number, since it is larger than the sum of its proper divisors (109101001123).

1200111012221 is a wasteful number, since it uses less digits than its factorization.

1200111012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109101001122.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1200111012221 its reverse (1222101110021), we get a palindrome (2422212122242).

The spelling of 1200111012221 in words is "one trillion, two hundred billion, one hundred eleven million, twelve thousand, two hundred twenty-one".