11012031221 has 4 divisors (see below), whose sum is σ = 11013850572. Its totient is φ = 11010211872.

The previous prime is 11012031187. The next prime is 11012031271. The reversal of 11012031221 is 12213021011.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7841102500 + 3170928721 = 88550^2 + 56311^2 .

It is a cyclic number.

It is not a de Polignac number, because 11012031221 - 2⁶ = 11012031157 is a prime.

It is a super-2 number, since 2×11012031221² (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 = 11012031196 and 11012031205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012031271) 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, 900566 + ... + 912711.

It is an arithmetic number, because the mean of its divisors is an integer number (2753462643).

Almost surely, 2^11012031221 is an apocalyptic number.

It is an amenable number.

11012031221 is a deficient number, since it is larger than the sum of its proper divisors (1819351).

11012031221 is an equidigital number, since it uses as much as digits as its factorization.

11012031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819350.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 11012031221 its reverse (12213021011), we get a palindrome (23225052232).

The spelling of 11012031221 in words is "eleven billion, twelve million, thirty-one thousand, two hundred twenty-one".