11201220000121 has 4 divisors (see below), whose sum is σ = 11207653787044. Its totient is φ = 11194786213200.

The previous prime is 11201220000101. The next prime is 11201220000143. The reversal of 11201220000121 is 12100002210211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2066590254096 + 9134629746025 = 1437564^2 + 3022355^2 .

It is a cyclic number.

It is not a de Polignac number, because 11201220000121 - 2²⁵ = 11201186445689 is a prime.

It is a super-2 number, since 2×11201220000121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11201220000101) 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, 3216890850 + ... + 3216894331.

It is an arithmetic number, because the mean of its divisors is an integer number (2801913446761).

Almost surely, 2^{11201220000121} is an apocalyptic number.

It is an amenable number.

11201220000121 is a deficient number, since it is larger than the sum of its proper divisors (6433786923).

11201220000121 is an equidigital number, since it uses as much as digits as its factorization.

11201220000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6433786922.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 11201220000121 its reverse (12100002210211), we get a palindrome (23301222210332).

The spelling of 11201220000121 in words is "eleven trillion, two hundred one billion, two hundred twenty million, one hundred twenty-one", and thus it is an aban number.