12101221220 has 48 divisors (see below), whose sum is σ = 29181902400. Its totient is φ = 4168840320.

The previous prime is 12101221213. The next prime is 12101221229. The reversal of 12101221220 is 2212210121.

It is a junction number, because it is equal to n+sod(n) for n = 12101221195 and 12101221204.

It is not an unprimeable number, because it can be changed into a prime (12101221229) 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, 1443335 + ... + 1451694.

It is an arithmetic number, because the mean of its divisors is an integer number (607956300).

Almost surely, 2^12101221220 is an apocalyptic number.

12101221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12101221220 is an abundant number, since it is smaller than the sum of its proper divisors (17080681180).

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

12101221220 is a wasteful number, since it uses less digits than its factorization.

12101221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2895068 (or 2895066 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12101221220 its reverse (2212210121), we get a palindrome (14313431341).

The spelling of 12101221220 in words is "twelve billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty".