2021432420 has 96 divisors (see below), whose sum is σ = 5120236800. Its totient is φ = 654856704.

The previous prime is 2021432377. The next prime is 2021432437. The reversal of 2021432420 is 242341202.

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 = 2021432392 and 2021432401.

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, 1353194 + ... + 1354686.

It is an arithmetic number, because the mean of its divisors is an integer number (53335800).

Almost surely, 2^2021432420 is an apocalyptic number.

2021432420 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 2021432420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2560118400).

2021432420 is an abundant number, since it is smaller than the sum of its proper divisors (3098804380).

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

2021432420 is a wasteful number, since it uses less digits than its factorization.

2021432420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037 (or 2035 counting only the distinct ones).

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

The square root of 2021432420 is about 44960.3427478039. The cubic root of 2021432420 is about 1264.4055949154.

Adding to 2021432420 its reverse (242341202), we get a palindrome (2263773622).

The spelling of 2021432420 in words is "two billion, twenty-one million, four hundred thirty-two thousand, four hundred twenty".