11231232221 has 32 divisors (see below), whose sum is σ = 12852022656. Its totient is φ = 9806227200.

The previous prime is 11231232217. The next prime is 11231232241. The reversal of 11231232221 is 12223213211.

It is not a de Polignac number, because 11231232221 - 2² = 11231232217 is a prime.

It is a super-2 number, since 2×11231232221² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11231232193 and 11231232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231232211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3489605 + ... + 3492821.

It is an arithmetic number, because the mean of its divisors is an integer number (401625708).

Almost surely, 2^11231232221 is an apocalyptic number.

11231232221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11231232221 is a deficient number, since it is larger than the sum of its proper divisors (1620790435).

11231232221 is an equidigital number, since it uses as much as digits as its factorization.

11231232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3354 (or 3332 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 11231232221 its reverse (12223213211), we get a palindrome (23454445432).

The spelling of 11231232221 in words is "eleven billion, two hundred thirty-one million, two hundred thirty-two thousand, two hundred twenty-one".