12210155220 has 24 divisors (see below), whose sum is σ = 34188434784. Its totient is φ = 3256041376.

The previous prime is 12210155213. The next prime is 12210155227. The reversal of 12210155220 is 2255101221.

It is an interprime number because it is at equal distance from previous prime (12210155213) and next prime (12210155227).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210155227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101751234 + ... + 101751353.

It is an arithmetic number, because the mean of its divisors is an integer number (1424518116).

Almost surely, 2^12210155220 is an apocalyptic number.

12210155220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12210155220 is an abundant number, since it is smaller than the sum of its proper divisors (21978279564).

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

12210155220 is a wasteful number, since it uses less digits than its factorization.

12210155220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203502599 (or 203502597 counting only the distinct ones).

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

Adding to 12210155220 its reverse (2255101221), we get a palindrome (14465256441).

The spelling of 12210155220 in words is "twelve billion, two hundred ten million, one hundred fifty-five thousand, two hundred twenty".