12212215500 has 48 divisors (see below), whose sum is σ = 35561975904. Its totient is φ = 3256590400.

The previous prime is 12212215487. The next prime is 12212215501. The reversal of 12212215500 is 551221221.

It is not an unprimeable number, because it can be changed into a prime (12212215501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4069239 + ... + 4072238.

It is an arithmetic number, because the mean of its divisors is an integer number (740874498).

Almost surely, 2^12212215500 is an apocalyptic number.

12212215500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212215500 is an abundant number, since it is smaller than the sum of its proper divisors (23349760404).

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

12212215500 is a wasteful number, since it uses less digits than its factorization.

12212215500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8141499 (or 8141487 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 12212215500 its reverse (551221221), we get a palindrome (12763436721).

The spelling of 12212215500 in words is "twelve billion, two hundred twelve million, two hundred fifteen thousand, five hundred".