11031222121 has 4 divisors (see below), whose sum is σ = 11140442244. Its totient is φ = 10922002000.

The previous prime is 11031222071. The next prime is 11031222149. The reversal of 11031222121 is 12122213011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12122213011 = 101 ⋅120021911.

It can be written as a sum of positive squares in 2 ways, for example, as 10092412521 + 938809600 = 100461^2 + 30640^2 .

It is a cyclic number.

It is not a de Polignac number, because 11031222121 - 2³¹ = 8883738473 is a prime.

It is a super-2 number, since 2×11031222121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031222095 and 11031222104.

It is not an unprimeable number, because it can be changed into a prime (11031222221) 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, 54609910 + ... + 54610111.

It is an arithmetic number, because the mean of its divisors is an integer number (2785110561).

Almost surely, 2^11031222121 is an apocalyptic number.

It is an amenable number.

11031222121 is a deficient number, since it is larger than the sum of its proper divisors (109220123).

11031222121 is a wasteful number, since it uses less digits than its factorization.

11031222121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109220122.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 11031222121 its reverse (12122213011), we get a palindrome (23153435132).

The spelling of 11031222121 in words is "eleven billion, thirty-one million, two hundred twenty-two thousand, one hundred twenty-one".