4430021421 has 16 divisors (see below), whose sum is σ = 7044009984. Its totient is φ = 2421377904.

The previous prime is 4430021413. The next prime is 4430021443. The reversal of 4430021421 is 1241200344.

It is not a de Polignac number, because 4430021421 - 2³ = 4430021413 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4430021461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4585461 + ... + 4586426.

It is an arithmetic number, because the mean of its divisors is an integer number (440250624).

Almost surely, 2^4430021421 is an apocalyptic number.

It is an amenable number.

4430021421 is a deficient number, since it is larger than the sum of its proper divisors (2613988563).

4430021421 is a wasteful number, since it uses less digits than its factorization.

4430021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9171920.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 4430021421 is about 66558.4060881869. The cubic root of 4430021421 is about 1642.3609438189.

Adding to 4430021421 its reverse (1241200344), we get a palindrome (5671221765).

The spelling of 4430021421 in words is "four billion, four hundred thirty million, twenty-one thousand, four hundred twenty-one".