11111220001001 has 8 divisors (see below), whose sum is σ = 11186466669504. Its totient is φ = 11036077052080.

The previous prime is 11111220000971. The next prime is 11111220001003. The reversal of 11111220001001 is 10010002211111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11111220001001 - 2¹⁰ = 11111219999977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111220001003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25714910 + ... + 26143431.

It is an arithmetic number, because the mean of its divisors is an integer number (1398308333688).

Almost surely, 2^{11111220001001} is an apocalyptic number.

It is an amenable number.

11111220001001 is a deficient number, since it is larger than the sum of its proper divisors (75246668503).

11111220001001 is a wasteful number, since it uses less digits than its factorization.

11111220001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51859791.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 11111220001001 its reverse (10010002211111), we get a palindrome (21121222212112).

The spelling of 11111220001001 in words is "eleven trillion, one hundred eleven billion, two hundred twenty million, one thousand, one".