500121074237721 has 4 divisors (see below), whose sum is σ = 666828098983632. Its totient is φ = 333414049491812.

The previous prime is 500121074237699. The next prime is 500121074237761. The reversal of 500121074237721 is 127732470121005.

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 not a de Polignac number, because 500121074237721 - 2⁹ = 500121074237209 is a prime.

It is not an unprimeable number, because it can be changed into a prime (500121074237761) 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, 83353512372951 + ... + 83353512372956.

It is an arithmetic number, because the mean of its divisors is an integer number (166707024745908).

Almost surely, 2^{500121074237721} is an apocalyptic number.

It is an amenable number.

500121074237721 is a deficient number, since it is larger than the sum of its proper divisors (166707024745911).

500121074237721 is a wasteful number, since it uses less digits than its factorization.

500121074237721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166707024745910.

The product of its (nonzero) digits is 164640, while the sum is 42.

The spelling of 500121074237721 in words is "five hundred trillion, one hundred twenty-one billion, seventy-four million, two hundred thirty-seven thousand, seven hundred twenty-one".