51362421 has 16 divisors (see below), whose sum is σ = 74906688. Its totient is φ = 31046400.

The previous prime is 51362417. The next prime is 51362447. The reversal of 51362421 is 12426315.

It is not a de Polignac number, because 51362421 - 2² = 51362417 is a prime.

It is a super-3 number, since 3×51362421³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51362391 and 51362400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51362471) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12045 + ... + 15741.

It is an arithmetic number, because the mean of its divisors is an integer number (4681668).

Almost surely, 2^51362421 is an apocalyptic number.

It is an amenable number.

51362421 is a deficient number, since it is larger than the sum of its proper divisors (23544267).

51362421 is a wasteful number, since it uses less digits than its factorization.

51362421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132.

The product of its digits is 1440, while the sum is 24.

The square root of 51362421 is about 7166.7580536809. The cubic root of 51362421 is about 371.7193440409.

Adding to 51362421 its reverse (12426315), we get a palindrome (63788736).

It can be divided in two parts, 5136 and 2421, that added together give a palindrome (7557).

The spelling of 51362421 in words is "fifty-one million, three hundred sixty-two thousand, four hundred twenty-one".