11211423221 has 4 divisors (see below), whose sum is σ = 11299702272. Its totient is φ = 11123144172.

The previous prime is 11211423217. The next prime is 11211423253. The reversal of 11211423221 is 12232411211.

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 11211423221 - 2² = 11211423217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11211423193 and 11211423202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11211423281) 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, 44139335 + ... + 44139588.

It is an arithmetic number, because the mean of its divisors is an integer number (2824925568).

Almost surely, 2^11211423221 is an apocalyptic number.

It is an amenable number.

11211423221 is a deficient number, since it is larger than the sum of its proper divisors (88279051).

11211423221 is an equidigital number, since it uses as much as digits as its factorization.

11211423221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88279050.

The product of its digits is 192, while the sum is 20.

Adding to 11211423221 its reverse (12232411211), we get a palindrome (23443834432).

The spelling of 11211423221 in words is "eleven billion, two hundred eleven million, four hundred twenty-three thousand, two hundred twenty-one".