4331405421 has 60 divisors (see below), whose sum is σ = 7541207388. Its totient is φ = 2470341888.

The previous prime is 4331405413. The next prime is 4331405447. The reversal of 4331405421 is 1245041334.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2068976196 + 2262429225 = 45486^2 + 47565^2 .

It is not a de Polignac number, because 4331405421 - 2³ = 4331405413 is a prime.

It is a super-2 number, since 2×4331405421² = 37522145842136374482, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4331405411) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3877155 + ... + 3878271.

Almost surely, 2^4331405421 is an apocalyptic number.

It is an amenable number.

4331405421 is a deficient number, since it is larger than the sum of its proper divisors (3209801967).

4331405421 is a wasteful number, since it uses less digits than its factorization.

4331405421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2120 (or 2104 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 4331405421 is about 65813.4136859653. The cubic root of 4331405421 is about 1630.0826009805.

Adding to 4331405421 its reverse (1245041334), we get a palindrome (5576446755).

The spelling of 4331405421 in words is "four billion, three hundred thirty-one million, four hundred five thousand, four hundred twenty-one".