51025221 has 40 divisors (see below), whose sum is σ = 83913984. Its totient is φ = 30702240.

The previous prime is 51025207. The next prime is 51025223. The reversal of 51025221 is 12252015.

It is not a de Polignac number, because 51025221 - 2¹⁸ = 50763077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51025194 and 51025203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51025223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 48976 + ... + 50006.

Almost surely, 2^51025221 is an apocalyptic number.

It is an amenable number.

51025221 is a deficient number, since it is larger than the sum of its proper divisors (32888763).

51025221 is a wasteful number, since it uses less digits than its factorization.

51025221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103 (or 1094 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 51025221 is about 7143.1940334839. The cubic root of 51025221 is about 370.9040977721.

Adding to 51025221 its reverse (12252015), we get a palindrome (63277236).

The spelling of 51025221 in words is "fifty-one million, twenty-five thousand, two hundred twenty-one".