75047021 has 4 divisors (see below), whose sum is σ = 85768032. Its totient is φ = 64326012.

The previous prime is 75047009. The next prime is 75047051. The reversal of 75047021 is 12074057.

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: 12074057 = 23 ⋅524959.

It is a cyclic number.

It is not a de Polignac number, because 75047021 - 2¹⁸ = 74784877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75047051) 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, 5360495 + ... + 5360508.

It is an arithmetic number, because the mean of its divisors is an integer number (21442008).

Almost surely, 2^75047021 is an apocalyptic number.

It is an amenable number.

75047021 is a deficient number, since it is larger than the sum of its proper divisors (10721011).

75047021 is a wasteful number, since it uses less digits than its factorization.

75047021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10721010.

The product of its (nonzero) digits is 1960, while the sum is 26.

The square root of 75047021 is about 8662.9683711762. The cubic root of 75047021 is about 421.8044454558.

The spelling of 75047021 in words is "seventy-five million, forty-seven thousand, twenty-one".