57221243100521 has 4 divisors (see below), whose sum is σ = 57466827835092. Its totient is φ = 56975658365952.

The previous prime is 57221243100503. The next prime is 57221243100523. The reversal of 57221243100521 is 12500134212275.

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 7036260234025 + 50184982866496 = 2652595^2 + 7084136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57221243100521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57221243100523) 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, 122792366936 + ... + 122792367401.

It is an arithmetic number, because the mean of its divisors is an integer number (14366706958773).

Almost surely, 2^{57221243100521} is an apocalyptic number.

It is an amenable number.

57221243100521 is a deficient number, since it is larger than the sum of its proper divisors (245584734571).

57221243100521 is a wasteful number, since it uses less digits than its factorization.

57221243100521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245584734570.

The product of its (nonzero) digits is 33600, while the sum is 35.

Adding to 57221243100521 its reverse (12500134212275), we get a palindrome (69721377312796).

The spelling of 57221243100521 in words is "fifty-seven trillion, two hundred twenty-one billion, two hundred forty-three million, one hundred thousand, five hundred twenty-one".