11661321210 has 128 divisors (see below), whose sum is σ = 34926336000. Its totient is φ = 2420824320.

The previous prime is 11661321179. The next prime is 11661321223. The reversal of 11661321210 is 1212316611.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3576561 + ... + 3579819.

It is an arithmetic number, because the mean of its divisors is an integer number (272862000).

Almost surely, 2^11661321210 is an apocalyptic number.

11661321210 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 11661321210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17463168000).

11661321210 is an abundant number, since it is smaller than the sum of its proper divisors (23265014790).

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

11661321210 is a wasteful number, since it uses less digits than its factorization.

11661321210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4836.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 11661321210 its reverse (1212316611), we get a palindrome (12873637821).

The spelling of 11661321210 in words is "eleven billion, six hundred sixty-one million, three hundred twenty-one thousand, two hundred ten".