744401531433421 has 4 divisors (see below), whose sum is σ = 745930076672992. Its totient is φ = 742872986193852.

The previous prime is 744401531433347. The next prime is 744401531433473. The reversal of 744401531433421 is 124334135104447.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 744401531433421 - 2³⁷ = 744264092479949 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 (744401531433491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764272619055 + ... + 764272620028.

It is an arithmetic number, because the mean of its divisors is an integer number (186482519168248).

Almost surely, 2^{744401531433421} is an apocalyptic number.

It is an amenable number.

744401531433421 is a deficient number, since it is larger than the sum of its proper divisors (1528545239571).

744401531433421 is a wasteful number, since it uses less digits than its factorization.

744401531433421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528545239570.

The product of its (nonzero) digits is 1935360, while the sum is 46.

Adding to 744401531433421 its reverse (124334135104447), we get a palindrome (868735666537868).

The spelling of 744401531433421 in words is "seven hundred forty-four trillion, four hundred one billion, five hundred thirty-one million, four hundred thirty-three thousand, four hundred twenty-one".