11211200001 has 24 divisors (see below), whose sum is σ = 17437174560. Its totient is φ = 6915244416.

The previous prime is 11211199991. The next prime is 11211200009. The reversal of 11211200001 is 10000211211.

It is a happy number.

It is not a de Polignac number, because 11211200001 - 2⁷ = 11211199873 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (11211200009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 611955 + ... + 630008.

It is an arithmetic number, because the mean of its divisors is an integer number (726548940).

Almost surely, 2^11211200001 is an apocalyptic number.

It is an amenable number.

11211200001 is a deficient number, since it is larger than the sum of its proper divisors (6225974559).

11211200001 is a wasteful number, since it uses less digits than its factorization.

11211200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242045 (or 1242042 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 11211200001 its reverse (10000211211), we get a palindrome (21211411212).

The spelling of 11211200001 in words is "eleven billion, two hundred eleven million, two hundred thousand, one".