2220121020 has 96 divisors (see below), whose sum is σ = 6769949760. Its totient is φ = 540334080.

The previous prime is 2220120997. The next prime is 2220121039. The reversal of 2220121020 is 201210222.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 2220120987 and 2220121005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 53430 + ... + 85410.

It is an arithmetic number, because the mean of its divisors is an integer number (70520310).

Almost surely, 2^2220121020 is an apocalyptic number.

2220121020 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 2220121020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3384974880).

2220121020 is an abundant number, since it is smaller than the sum of its proper divisors (4549828740).

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

2220121020 is a wasteful number, since it uses less digits than its factorization.

2220121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32095 (or 32093 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 2220121020 is about 47118.1601932843. The cubic root of 2220121020 is about 1304.5444542596.

Adding to 2220121020 its reverse (201210222), we get a palindrome (2421331242).

It can be divided in two parts, 2 and 220121020, that added together give a palindrome (220121022).

The spelling of 2220121020 in words is "two billion, two hundred twenty million, one hundred twenty-one thousand, twenty".