11211220001001 has 16 divisors (see below), whose sum is σ = 16160317121600. Its totient is φ = 6889398349248.

The previous prime is 11211220000999. The next prime is 11211220001017. The reversal of 11211220001001 is 10010002211211.

It is not a de Polignac number, because 11211220001001 - 2¹ = 11211220000999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11211220001021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2657944786 + ... + 2657949003.

It is an arithmetic number, because the mean of its divisors is an integer number (1010019820100).

Almost surely, 2^{11211220001001} is an apocalyptic number.

It is an amenable number.

11211220001001 is a deficient number, since it is larger than the sum of its proper divisors (4949097120599).

11211220001001 is a wasteful number, since it uses less digits than its factorization.

11211220001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5315893848.

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

Adding to 11211220001001 its reverse (10010002211211), we get a palindrome (21221222212212).

The spelling of 11211220001001 in words is "eleven trillion, two hundred eleven billion, two hundred twenty million, one thousand, one".