52131421 has 4 divisors (see below), whose sum is σ = 54875200. Its totient is φ = 49387644.

The previous prime is 52131419. The next prime is 52131449. The reversal of 52131421 is 12413125.

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 52131421 - 2¹ = 52131419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 2743759 = 52131421 / (5 + 2 + 1 + 3 + 1 + 4 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52131451) 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, 1371861 + ... + 1371898.

It is an arithmetic number, because the mean of its divisors is an integer number (13718800).

Almost surely, 2^52131421 is an apocalyptic number.

It is an amenable number.

52131421 is a deficient number, since it is larger than the sum of its proper divisors (2743779).

52131421 is a wasteful number, since it uses less digits than its factorization.

52131421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743778.

The product of its digits is 240, while the sum is 19.

The square root of 52131421 is about 7220.2092074953. The cubic root of 52131421 is about 373.5652936846.

Adding to 52131421 its reverse (12413125), we get a palindrome (64544546).

The spelling of 52131421 in words is "fifty-two million, one hundred thirty-one thousand, four hundred twenty-one".