2220121011220 has 96 divisors (see below), whose sum is σ = 5457345933312. Its totient is φ = 742841228928.

The previous prime is 2220121011137. The next prime is 2220121011223. The reversal of 2220121011220 is 221101210222.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2220121011194 and 2220121011203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220121011223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1797087 + ... + 2769433.

It is an arithmetic number, because the mean of its divisors is an integer number (56847353472).

Almost surely, 2^{2220121011220} is an apocalyptic number.

2220121011220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2220121011220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2728672966656).

2220121011220 is an abundant number, since it is smaller than the sum of its proper divisors (3237224922092).

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

2220121011220 is a wasteful number, since it uses less digits than its factorization.

2220121011220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972757 (or 972755 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2220121011220 its reverse (221101210222), we get a palindrome (2441222221442).

The spelling of 2220121011220 in words is "two trillion, two hundred twenty billion, one hundred twenty-one million, eleven thousand, two hundred twenty".