11213121210 has 64 divisors (see below), whose sum is σ = 27659187072. Its totient is φ = 2907207936.

The previous prime is 11213121133. The next prime is 11213121217. The reversal of 11213121210 is 1212131211.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 11213121210.

It is not an unprimeable number, because it can be changed into a prime (11213121217) 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, 1980744 + ... + 1986396.

It is an arithmetic number, because the mean of its divisors is an integer number (432174798).

Almost surely, 2^11213121210 is an apocalyptic number.

11213121210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11213121210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13829593536).

11213121210 is an abundant number, since it is smaller than the sum of its proper divisors (16446065862).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11213121210 is a wasteful number, since it uses less digits than its factorization.

11213121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7487.

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 11213121210 its reverse (1212131211), we get a palindrome (12425252421).

The spelling of 11213121210 in words is "eleven billion, two hundred thirteen million, one hundred twenty-one thousand, two hundred ten".