4340021220 has 72 divisors (see below), whose sum is σ = 13173274296. Its totient is φ = 1156588032.

The previous prime is 4340021209. The next prime is 4340021221. The reversal of 4340021220 is 221200434.

4340021220 is a `hidden beast` number, since 43 + 400 + 2 + 1 + 220 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 559984896 + 3780036324 = 23664^2 + 61482^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 4340021193 and 4340021202.

It is not an unprimeable number, because it can be changed into a prime (4340021221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 304984 + ... + 318896.

It is an arithmetic number, because the mean of its divisors is an integer number (182962143).

Almost surely, 2^4340021220 is an apocalyptic number.

It is an amenable number.

4340021220 is an abundant number, since it is smaller than the sum of its proper divisors (8833253076).

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

4340021220 is a wasteful number, since it uses less digits than its factorization.

4340021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15661 (or 15656 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 4340021220 is about 65878.8374214360. The cubic root of 4340021220 is about 1631.1627093820.

Adding to 4340021220 its reverse (221200434), we get a palindrome (4561221654).

It can be divided in two parts, 43400 and 21220, that added together give a triangular number (64620 = T₃₅₉).

The spelling of 4340021220 in words is "four billion, three hundred forty million, twenty-one thousand, two hundred twenty".