75522021 has 4 divisors (see below), whose sum is σ = 100696032. Its totient is φ = 50348012.

The previous prime is 75522011. The next prime is 75522023. The reversal of 75522021 is 12022557.

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: 12022557 = 3 ⋅4007519.

It is a cyclic number.

It is not a de Polignac number, because 75522021 - 2⁵ = 75521989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 75521982 and 75522000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75522023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12587001 + ... + 12587006.

It is an arithmetic number, because the mean of its divisors is an integer number (25174008).

Almost surely, 2^75522021 is an apocalyptic number.

It is an amenable number.

75522021 is a deficient number, since it is larger than the sum of its proper divisors (25174011).

75522021 is a wasteful number, since it uses less digits than its factorization.

75522021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25174010.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 75522021 is about 8690.3406722637. The cubic root of 75522021 is about 422.6924926115.

Adding to 75522021 its reverse (12022557), we get a palindrome (87544578).

The spelling of 75522021 in words is "seventy-five million, five hundred twenty-two thousand, twenty-one".