75415921421 has 4 divisors (see below), whose sum is σ = 75531413532. Its totient is φ = 75300429312.

The previous prime is 75415921411. The next prime is 75415921423. The reversal of 75415921421 is 12412951457.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 40628449225 + 34787472196 = 201565^2 + 186514^2 .

It is a cyclic number.

It is not a de Polignac number, because 75415921421 - 2²⁶ = 75348812557 is a prime.

It is a super-2 number, since 2×75415921421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75415921423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57745076 + ... + 57746381.

It is an arithmetic number, because the mean of its divisors is an integer number (18882853383).

Almost surely, 2^75415921421 is an apocalyptic number.

It is an amenable number.

75415921421 is a deficient number, since it is larger than the sum of its proper divisors (115492111).

75415921421 is a wasteful number, since it uses less digits than its factorization.

75415921421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115492110.

The product of its digits is 100800, while the sum is 41.

The spelling of 75415921421 in words is "seventy-five billion, four hundred fifteen million, nine hundred twenty-one thousand, four hundred twenty-one".