11211125530 has 24 divisors (see below), whose sum is σ = 22181353236. Its totient is φ = 4076772480.

The previous prime is 11211125509. The next prime is 11211125531. The reversal of 11211125530 is 3552111211.

It can be written as a sum of positive squares in 2 ways, for example, as 11019330729 + 191794801 = 104973^2 + 13849^2 .

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (11211125531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4631487 + ... + 4633906.

Almost surely, 2^11211125530 is an apocalyptic number.

11211125530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11211125530 is a deficient number, since it is larger than the sum of its proper divisors (10970227706).

11211125530 is a wasteful number, since it uses less digits than its factorization.

11211125530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9265422 (or 9265411 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 22.

Adding to 11211125530 its reverse (3552111211), we get a palindrome (14763236741).

It can be divided in two parts, 112111 and 25530, that added together give a square (137641 = 371²).

The spelling of 11211125530 in words is "eleven billion, two hundred eleven million, one hundred twenty-five thousand, five hundred thirty".