1200011101221 has 16 divisors (see below), whose sum is σ = 1607449686336. Its totient is φ = 796292386176.

The previous prime is 1200011101207. The next prime is 1200011101249. The reversal of 1200011101221 is 1221011100021.

It is not a de Polignac number, because 1200011101221 - 2⁵ = 1200011101189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1200011101197 and 1200011101206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1200011101021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1685331 + ... + 2289183.

It is an arithmetic number, because the mean of its divisors is an integer number (100465605396).

Almost surely, 2^{1200011101221} is an apocalyptic number.

It is an amenable number.

1200011101221 is a deficient number, since it is larger than the sum of its proper divisors (407438585115).

1200011101221 is a wasteful number, since it uses less digits than its factorization.

1200011101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606932.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1200011101221 its reverse (1221011100021), we get a palindrome (2421022201242).

The spelling of 1200011101221 in words is "one trillion, two hundred billion, eleven million, one hundred one thousand, two hundred twenty-one".