2220121220 has 24 divisors (see below), whose sum is σ = 4668494208. Its totient is φ = 886860000.

The previous prime is 2220121219. The next prime is 2220121237. The reversal of 2220121220 is 221210222.

It is a junction number, because it is equal to n+sod(n) for n = 2220121195 and 2220121204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58886 + ... + 88925.

It is an arithmetic number, because the mean of its divisors is an integer number (194520592).

Almost surely, 2^2220121220 is an apocalyptic number.

2220121220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2220121220 is an abundant number, since it is smaller than the sum of its proper divisors (2448372988).

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

2220121220 is a wasteful number, since it uses less digits than its factorization.

2220121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148571 (or 148569 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 2220121220 is about 47118.1623156082. The cubic root of 2220121220 is about 1304.5444934329.

Adding to 2220121220 its reverse (221210222), we get a palindrome (2441331442).

It can be divided in two parts, 2220 and 121220, that multiplied together give a triangular number (269108400 = T₂₃₁₉₉).

The spelling of 2220121220 in words is "two billion, two hundred twenty million, one hundred twenty-one thousand, two hundred twenty".