75122031421 has 2 divisors, whose sum is σ = 75122031422. Its totient is φ = 75122031420.

The previous prime is 75122031353. The next prime is 75122031431. The reversal of 75122031421 is 12413022157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49357287225 + 25764744196 = 222165^2 + 160514^2 .

It is an emirp because it is prime and its reverse (12413022157) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 75122031421 - 2⁷ = 75122031293 is a prime.

It is a super-2 number, since 2×75122031421² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 75122031421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75122031431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37561015710 + 37561015711.

It is an arithmetic number, because the mean of its divisors is an integer number (37561015711).

Almost surely, 2^75122031421 is an apocalyptic number.

It is an amenable number.

75122031421 is a deficient number, since it is larger than the sum of its proper divisors (1).

75122031421 is an equidigital number, since it uses as much as digits as its factorization.

75122031421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 28.

Adding to 75122031421 its reverse (12413022157), we get a palindrome (87535053578).

The spelling of 75122031421 in words is "seventy-five billion, one hundred twenty-two million, thirty-one thousand, four hundred twenty-one".