11220021123 has 16 divisors (see below), whose sum is σ = 15007704576. Its totient is φ = 7456216320.

The previous prime is 11220021119. The next prime is 11220021139. The reversal of 11220021123 is 32112002211.

It is not a de Polignac number, because 11220021123 - 2² = 11220021119 is a prime.

It is a super-2 number, since 2×11220021123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11220021103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1269586 + ... + 1278392.

It is an arithmetic number, because the mean of its divisors is an integer number (937981536).

Almost surely, 2^11220021123 is an apocalyptic number.

11220021123 is a deficient number, since it is larger than the sum of its proper divisors (3787683453).

11220021123 is an equidigital number, since it uses as much as digits as its factorization.

11220021123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10114.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 11220021123 its reverse (32112002211), we get a palindrome (43332023334).

The spelling of 11220021123 in words is "eleven billion, two hundred twenty million, twenty-one thousand, one hundred twenty-three".