12121201022220 has 72 divisors (see below), whose sum is σ = 36767932424496. Its totient is φ = 3232294837632.

The previous prime is 12121201022207. The next prime is 12121201022233. The reversal of 12121201022220 is 2222010212121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12121201022207) and next prime (12121201022233).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12121201022193 and 12121201022202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37909539 + ... + 38227941.

It is an arithmetic number, because the mean of its divisors is an integer number (510665728118).

Almost surely, 2^{12121201022220} is an apocalyptic number.

12121201022220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12121201022220 is an abundant number, since it is smaller than the sum of its proper divisors (24646731402276).

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

12121201022220 is a wasteful number, since it uses less digits than its factorization.

12121201022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529911 (or 529906 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12121201022220 its reverse (2222010212121), we get a palindrome (14343211234341).

The spelling of 12121201022220 in words is "twelve trillion, one hundred twenty-one billion, two hundred one million, twenty-two thousand, two hundred twenty".