2123443220 has 48 divisors (see below), whose sum is σ = 4630001040. Its totient is φ = 817065984.

The previous prime is 2123443219. The next prime is 2123443277. The reversal of 2123443220 is 223443212.

It can be written as a sum of positive squares in 8 ways, for example, as 167857936 + 1955585284 = 12956^2 + 44222^2 .

It is a super-2 number, since 2×2123443220² = 9018022217127936800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154052 + ... + 167268.

It is an arithmetic number, because the mean of its divisors is an integer number (96458355).

Almost surely, 2^2123443220 is an apocalyptic number.

2123443220 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 2123443220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2315000520).

2123443220 is an abundant number, since it is smaller than the sum of its proper divisors (2506557820).

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

2123443220 is a wasteful number, since it uses less digits than its factorization.

2123443220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13532 (or 13530 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 2123443220 is about 46080.8335428082. The cubic root of 2123443220 is about 1285.3267641394.

Adding to 2123443220 its reverse (223443212), we get a palindrome (2346886432).

The spelling of 2123443220 in words is "two billion, one hundred twenty-three million, four hundred forty-three thousand, two hundred twenty".