51267421 has 4 divisors (see below), whose sum is σ = 51286144. Its totient is φ = 51248700.

The previous prime is 51267413. The next prime is 51267443. The reversal of 51267421 is 12476215.

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 51267421 - 2³ = 51267413 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 51267421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51267451) 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, 4365 + ... + 11026.

It is an arithmetic number, because the mean of its divisors is an integer number (12821536).

Almost surely, 2^51267421 is an apocalyptic number.

It is an amenable number.

51267421 is a deficient number, since it is larger than the sum of its proper divisors (18723).

51267421 is a wasteful number, since it uses less digits than its factorization.

51267421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18722.

The product of its digits is 3360, while the sum is 28.

The square root of 51267421 is about 7160.1271636752. The cubic root of 51267421 is about 371.4900250741.

The spelling of 51267421 in words is "fifty-one million, two hundred sixty-seven thousand, four hundred twenty-one".