538142221 has 4 divisors (see below), whose sum is σ = 538192512. Its totient is φ = 538091932.

The previous prime is 538142219. The next prime is 538142239. The reversal of 538142221 is 122241835.

It is the 9471-st star 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 538142221 - 2¹ = 538142219 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 538142221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (538142251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1981 + ... + 32866.

It is an arithmetic number, because the mean of its divisors is an integer number (134548128).

Almost surely, 2^538142221 is an apocalyptic number.

It is an amenable number.

538142221 is a deficient number, since it is larger than the sum of its proper divisors (50291).

538142221 is a wasteful number, since it uses less digits than its factorization.

538142221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50290.

The product of its digits is 3840, while the sum is 28.

The square root of 538142221 is about 23197.8925982512. The cubic root of 538142221 is about 813.3903623715.

The spelling of 538142221 in words is "five hundred thirty-eight million, one hundred forty-two thousand, two hundred twenty-one".