11231222021 has 16 divisors (see below), whose sum is σ = 11407057200. Its totient is φ = 11057233920.

The previous prime is 11231221999. The next prime is 11231222033. The reversal of 11231222021 is 12022213211.

It can be written as a sum of positive squares in 8 ways, for example, as 287133025 + 10944088996 = 16945^2 + 104614^2 .

It is a cyclic number.

It is not a de Polignac number, because 11231222021 - 2³⁰ = 10157480197 is a prime.

It is a super-2 number, since 2×11231222021² (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 (11231222071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9228005 + ... + 9229221.

It is an arithmetic number, because the mean of its divisors is an integer number (712941075).

Almost surely, 2^11231222021 is an apocalyptic number.

It is an amenable number.

11231222021 is a deficient number, since it is larger than the sum of its proper divisors (175835179).

11231222021 is a wasteful number, since it uses less digits than its factorization.

11231222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864.

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

Adding to 11231222021 its reverse (12022213211), we get a palindrome (23253435232).

The spelling of 11231222021 in words is "eleven billion, two hundred thirty-one million, two hundred twenty-two thousand, twenty-one".