51133421 has 2 divisors, whose sum is σ = 51133422. Its totient is φ = 51133420.

The previous prime is 51133417. The next prime is 51133429. The reversal of 51133421 is 12433115.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50965321 + 168100 = 7139^2 + 410^2 .

It is a cyclic number.

It is not a de Polignac number, because 51133421 - 2² = 51133417 is a prime.

It is a super-2 number, since 2×51133421² = 5229253486326482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51133393 and 51133402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51133429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25566710 + 25566711.

It is an arithmetic number, because the mean of its divisors is an integer number (25566711).

Almost surely, 2^51133421 is an apocalyptic number.

It is an amenable number.

51133421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51133421 is an equidigital number, since it uses as much as digits as its factorization.

51133421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 360, while the sum is 20.

The square root of 51133421 is about 7150.7636655115. The cubic root of 51133421 is about 371.1660825265.

Adding to 51133421 its reverse (12433115), we get a palindrome (63566536).

The spelling of 51133421 in words is "fifty-one million, one hundred thirty-three thousand, four hundred twenty-one".