4331131421 has 6 divisors (see below), whose sum is σ = 4392997566. Its totient is φ = 4270124600.

The previous prime is 4331131397. The next prime is 4331131423. The reversal of 4331131421 is 1241311334.

It can be written as a sum of positive squares in only one way, i.e., 3992976100 + 338155321 = 63190^2 + 18389^2 .

It is a de Polignac number, because none of the positive numbers 2^k-4331131421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4331131423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 424550 + ... + 434631.

It is an arithmetic number, because the mean of its divisors is an integer number (732166261).

Almost surely, 2^4331131421 is an apocalyptic number.

It is an amenable number.

4331131421 is a deficient number, since it is larger than the sum of its proper divisors (61866145).

4331131421 is an frugal number, since it uses more digits than its factorization.

4331131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859323 (or 859252 counting only the distinct ones).

The product of its digits is 864, while the sum is 23.

The square root of 4331131421 is about 65811.3320105284. The cubic root of 4331131421 is about 1630.0482278377.

Adding to 4331131421 its reverse (1241311334), we get a palindrome (5572442755).

The spelling of 4331131421 in words is "four billion, three hundred thirty-one million, one hundred thirty-one thousand, four hundred twenty-one".