2143220420 has 24 divisors (see below), whose sum is σ = 4909923648. Its totient is φ = 779352800.

The previous prime is 2143220407. The next prime is 2143220423. The reversal of 2143220420 is 240223412.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 2143220392 and 2143220401.

It is not an unprimeable number, because it can be changed into a prime (2143220423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4870736 + ... + 4871175.

It is an arithmetic number, because the mean of its divisors is an integer number (204580152).

Almost surely, 2^2143220420 is an apocalyptic number.

2143220420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2143220420 is an abundant number, since it is smaller than the sum of its proper divisors (2766703228).

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

2143220420 is a wasteful number, since it uses less digits than its factorization.

2143220420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9741931 (or 9741929 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2143220420 is about 46294.9286639476. The cubic root of 2143220420 is about 1289.3048394859.

Adding to 2143220420 its reverse (240223412), we get a palindrome (2383443832).

The spelling of 2143220420 in words is "two billion, one hundred forty-three million, two hundred twenty thousand, four hundred twenty".