11121210001 has 4 divisors (see below), whose sum is σ = 12132229104. Its totient is φ = 10110190900.

The previous prime is 11121209993. The next prime is 11121210011. The reversal of 11121210001 is 10001212111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11121210001 - 2³ = 11121209993 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11121210001.

It is not an unprimeable number, because it can be changed into a prime (11121210011) 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, 505509535 + ... + 505509556.

It is an arithmetic number, because the mean of its divisors is an integer number (3033057276).

Almost surely, 2^11121210001 is an apocalyptic number.

11121210001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11121210001 is a deficient number, since it is larger than the sum of its proper divisors (1011019103).

11121210001 is a wasteful number, since it uses less digits than its factorization.

11121210001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1011019102.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 11121210001 its reverse (10001212111), we get a palindrome (21122422112).

It can be divided in two parts, 11121 and 210001, that added together give a palindrome (221122).

The spelling of 11121210001 in words is "eleven billion, one hundred twenty-one million, two hundred ten thousand, one".