75018021 has 16 divisors (see below), whose sum is σ = 108730944. Its totient is φ = 45730944.

The previous prime is 75018017. The next prime is 75018029. The reversal of 75018021 is 12081057.

It is not a de Polignac number, because 75018021 - 2² = 75018017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75017982 and 75018000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75018029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4816 + ... + 13161.

It is an arithmetic number, because the mean of its divisors is an integer number (6795684).

Almost surely, 2^75018021 is an apocalyptic number.

It is an amenable number.

75018021 is a deficient number, since it is larger than the sum of its proper divisors (33712923).

75018021 is a wasteful number, since it uses less digits than its factorization.

75018021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18100.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 75018021 is about 8661.2944182726. The cubic root of 75018021 is about 421.7501066128.

Adding to 75018021 its reverse (12081057), we get a palindrome (87099078).

The spelling of 75018021 in words is "seventy-five million, eighteen thousand, twenty-one".