51030421 has 8 divisors (see below), whose sum is σ = 55461560. Its totient is φ = 46671552.

The previous prime is 51030403. The next prime is 51030449. The reversal of 51030421 is 12403015.

It can be written as a sum of positive squares in 4 ways, for example, as 3572100 + 47458321 = 1890^2 + 6889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51030421 - 2⁵ = 51030389 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51030395 and 51030404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51000421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16590 + ... + 19423.

It is an arithmetic number, because the mean of its divisors is an integer number (6932695).

Almost surely, 2^51030421 is an apocalyptic number.

It is an amenable number.

51030421 is a deficient number, since it is larger than the sum of its proper divisors (4431139).

51030421 is a wasteful number, since it uses less digits than its factorization.

51030421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36135.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 51030421 is about 7143.5580070438. The cubic root of 51030421 is about 370.9166970041.

Adding to 51030421 its reverse (12403015), we get a palindrome (63433436).

The spelling of 51030421 in words is "fifty-one million, thirty thousand, four hundred twenty-one".