51351021 has 12 divisors (see below), whose sum is σ = 75068448. Its totient is φ = 33821064.

The previous prime is 51350989. The next prime is 51351043. The reversal of 51351021 is 12015315.

It is not a de Polignac number, because 51351021 - 2⁵ = 51350989 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51350985 and 51351003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51351821) 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, 33625 + ... + 35118.

It is an arithmetic number, because the mean of its divisors is an integer number (6255704).

Almost surely, 2^51351021 is an apocalyptic number.

It is an amenable number.

51351021 is a deficient number, since it is larger than the sum of its proper divisors (23717427).

51351021 is a wasteful number, since it uses less digits than its factorization.

51351021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68832 (or 68829 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 51351021 is about 7165.9626708489. The cubic root of 51351021 is about 371.6918407029.

Adding to 51351021 its reverse (12015315), we get a palindrome (63366336).

The spelling of 51351021 in words is "fifty-one million, three hundred fifty-one thousand, twenty-one".