1011200011221 has 16 divisors (see below), whose sum is σ = 1384736450048. Its totient is φ = 655899249600.

The previous prime is 1011200011201. The next prime is 1011200011223. The reversal of 1011200011221 is 1221100021101.

It is not a de Polignac number, because 1011200011221 - 2¹¹ = 1011200009173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011200011197 and 1011200011206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011200011223) 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, 7975836 + ... + 8101626.

It is an arithmetic number, because the mean of its divisors is an integer number (86546028128).

Almost surely, 2^{1011200011221} is an apocalyptic number.

It is an amenable number.

1011200011221 is a deficient number, since it is larger than the sum of its proper divisors (373536438827).

1011200011221 is a wasteful number, since it uses less digits than its factorization.

1011200011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198252.

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

Adding to 1011200011221 its reverse (1221100021101), we get a palindrome (2232300032322).

The spelling of 1011200011221 in words is "one trillion, eleven billion, two hundred million, eleven thousand, two hundred twenty-one".