75212011121 has 4 divisors (see below), whose sum is σ = 80997550452. Its totient is φ = 69426471792.

The previous prime is 75212011111. The next prime is 75212011163. The reversal of 75212011121 is 12111021257.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44916868096 + 30295143025 = 211936^2 + 174055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75212011121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75212011111) 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, 2892769646 + ... + 2892769671.

It is an arithmetic number, because the mean of its divisors is an integer number (20249387613).

Almost surely, 2^75212011121 is an apocalyptic number.

It is an amenable number.

75212011121 is a deficient number, since it is larger than the sum of its proper divisors (5785539331).

75212011121 is a wasteful number, since it uses less digits than its factorization.

75212011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5785539330.

The product of its (nonzero) digits is 280, while the sum is 23.

Adding to 75212011121 its reverse (12111021257), we get a palindrome (87323032378).

The spelling of 75212011121 in words is "seventy-five billion, two hundred twelve million, eleven thousand, one hundred twenty-one".