11555221210 has 24 divisors (see below), whose sum is σ = 22522428540. Its totient is φ = 4266542592.

The previous prime is 11555221193. The next prime is 11555221211. The reversal of 11555221210 is 1212255511.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 971132569 + 10584088641 = 31163^2 + 102879^2 .

It is not an unprimeable number, because it can be changed into a prime (11555221211) 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, 3417015 + ... + 3420394.

Almost surely, 2^11555221210 is an apocalyptic number.

11555221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11555221210 is a deficient number, since it is larger than the sum of its proper divisors (10967207330).

11555221210 is a wasteful number, since it uses less digits than its factorization.

11555221210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6837442 (or 6837429 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 25.

Adding to 11555221210 its reverse (1212255511), we get a palindrome (12767476721).

The spelling of 11555221210 in words is "eleven billion, five hundred fifty-five million, two hundred twenty-one thousand, two hundred ten".