11220121223 has 4 divisors (see below), whose sum is σ = 11295424200. Its totient is φ = 11144818248.

The previous prime is 11220121219. The next prime is 11220121249. The reversal of 11220121223 is 32212102211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11220121223 - 2² = 11220121219 is a prime.

It is a super-2 number, since 2×11220121223² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11220121123) 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, 37651265 + ... + 37651562.

It is an arithmetic number, because the mean of its divisors is an integer number (2823856050).

Almost surely, 2^11220121223 is an apocalyptic number.

11220121223 is a deficient number, since it is larger than the sum of its proper divisors (75302977).

11220121223 is an equidigital number, since it uses as much as digits as its factorization.

11220121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75302976.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 11220121223 its reverse (32212102211), we get a palindrome (43432223434).

The spelling of 11220121223 in words is "eleven billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty-three".