11211222011 has 8 divisors (see below), whose sum is σ = 12235048704. Its totient is φ = 10188166120.

The previous prime is 11211221981. The next prime is 11211222017. The reversal of 11211222011 is 11022211211.

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

It is a de Polignac number, because none of the positive numbers 2^k-11211222011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11211222017) 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, 162071 + ... + 220656.

It is an arithmetic number, because the mean of its divisors is an integer number (1529381088).

Almost surely, 2^11211222011 is an apocalyptic number.

11211222011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11211222011 is a deficient number, since it is larger than the sum of its proper divisors (1023826693).

11211222011 is a wasteful number, since it uses less digits than its factorization.

11211222011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385401.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11211222011 its reverse (11022211211), we get a palindrome (22233433222).

The spelling of 11211222011 in words is "eleven billion, two hundred eleven million, two hundred twenty-two thousand, eleven".