75244055421 has 4 divisors (see below), whose sum is σ = 100325407232. Its totient is φ = 50162703612.

The previous prime is 75244055413. The next prime is 75244055423. The reversal of 75244055421 is 12455044257.

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 not a de Polignac number, because 75244055421 - 2³ = 75244055413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 75244055421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75244055423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12540675901 + ... + 12540675906.

It is an arithmetic number, because the mean of its divisors is an integer number (25081351808).

Almost surely, 2^75244055421 is an apocalyptic number.

It is an amenable number.

75244055421 is a deficient number, since it is larger than the sum of its proper divisors (25081351811).

75244055421 is a wasteful number, since it uses less digits than its factorization.

75244055421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25081351810.

The product of its (nonzero) digits is 224000, while the sum is 39.

Adding to 75244055421 its reverse (12455044257), we get a palindrome (87699099678).

The spelling of 75244055421 in words is "seventy-five billion, two hundred forty-four million, fifty-five thousand, four hundred twenty-one".