11111222100001 has 4 divisors (see below), whose sum is σ = 11132548822404. Its totient is φ = 11089895377600.

The previous prime is 11111222099921. The next prime is 11111222100019. The reversal of 11111222100001 is 10000122211111.

It is a happy number.

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 2288397435025 + 8822824664976 = 1512745^2 + 2970324^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111222100001 - 2¹⁵ = 11111222067233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111222100031) 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, 10663360420 + ... + 10663361461.

It is an arithmetic number, because the mean of its divisors is an integer number (2783137205601).

Almost surely, 2^{11111222100001} is an apocalyptic number.

It is an amenable number.

11111222100001 is a deficient number, since it is larger than the sum of its proper divisors (21326722403).

11111222100001 is an equidigital number, since it uses as much as digits as its factorization.

11111222100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21326722402.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 11111222100001 its reverse (10000122211111), we get a palindrome (21111344311112).

It can be divided in two parts, 1111122 and 2100001, that added together give a palindrome (3211123).

The spelling of 11111222100001 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, one hundred thousand, one".