51842421 has 6 divisors (see below), whose sum is σ = 74883510. Its totient is φ = 34561608.

The previous prime is 51842359. The next prime is 51842429. The reversal of 51842421 is 12424815.

It can be written as a sum of positive squares in only one way, i.e., 51279921 + 562500 = 7161^2 + 750^2 .

It is not a de Polignac number, because 51842421 - 2¹³ = 51834229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51842429) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2880126 + ... + 2880143.

It is an arithmetic number, because the mean of its divisors is an integer number (12480585).

Almost surely, 2^51842421 is an apocalyptic number.

It is an amenable number.

51842421 is a deficient number, since it is larger than the sum of its proper divisors (23041089).

51842421 is a wasteful number, since it uses less digits than its factorization.

51842421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5760275 (or 5760272 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 51842421 is about 7200.1681230371. The cubic root of 51842421 is about 372.8737051071.

The spelling of 51842421 in words is "fifty-one million, eight hundred forty-two thousand, four hundred twenty-one".