75029421 has 4 divisors (see below), whose sum is σ = 100039232. Its totient is φ = 50019612.

The previous prime is 75029417. The next prime is 75029431. The reversal of 75029421 is 12492057.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12492057 = 3 ⋅4164019.

It is not a de Polignac number, because 75029421 - 2² = 75029417 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 (75029411) 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, 12504901 + ... + 12504906.

It is an arithmetic number, because the mean of its divisors is an integer number (25009808).

Almost surely, 2^75029421 is an apocalyptic number.

It is an amenable number.

75029421 is a deficient number, since it is larger than the sum of its proper divisors (25009811).

75029421 is a wasteful number, since it uses less digits than its factorization.

75029421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25009810.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 75029421 is about 8661.9524935202. The cubic root of 75029421 is about 421.7714690695.

The spelling of 75029421 in words is "seventy-five million, twenty-nine thousand, four hundred twenty-one".