75242021 has 4 divisors (see below), whose sum is σ = 75308544. Its totient is φ = 75175500.

The previous prime is 75242003. The next prime is 75242023. The reversal of 75242021 is 12024257.

It is a happy number.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75242021 is a prime.

It is a super-2 number, since 2×75242021² = 11322723448328882, which 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 (75242023) 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, 31535 + ... + 33836.

It is an arithmetic number, because the mean of its divisors is an integer number (18827136).

Almost surely, 2^75242021 is an apocalyptic number.

It is an amenable number.

75242021 is a deficient number, since it is larger than the sum of its proper divisors (66523).

75242021 is a wasteful number, since it uses less digits than its factorization.

75242021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66522.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 75242021 is about 8674.2158723426. The cubic root of 75242021 is about 422.1694642939.

Adding to 75242021 its reverse (12024257), we get a palindrome (87266278).

The spelling of 75242021 in words is "seventy-five million, two hundred forty-two thousand, twenty-one".