51353421 has 12 divisors (see below), whose sum is σ = 79650432. Its totient is φ = 29344728.

The previous prime is 51353417. The next prime is 51353429. The reversal of 51353421 is 12435315.

It is not a de Polignac number, because 51353421 - 2² = 51353417 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51353391 and 51353400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51353429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 174525 + ... + 174818.

It is an arithmetic number, because the mean of its divisors is an integer number (6637536).

Almost surely, 2^51353421 is an apocalyptic number.

It is an amenable number.

51353421 is a deficient number, since it is larger than the sum of its proper divisors (28297011).

51353421 is a wasteful number, since it uses less digits than its factorization.

51353421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349360 (or 349353 counting only the distinct ones).

The product of its digits is 1800, while the sum is 24.

The square root of 51353421 is about 7166.1301272025. The cubic root of 51353421 is about 371.6976312176.

Adding to 51353421 its reverse (12435315), we get a palindrome (63788736).

The spelling of 51353421 in words is "fifty-one million, three hundred fifty-three thousand, four hundred twenty-one".