51025230221 has 6 divisors (see below), whose sum is σ = 59355880110. Its totient is φ = 43735911576.

The previous prime is 51025230211. The next prime is 51025230307. The reversal of 51025230221 is 12203252015.

It can be written as a sum of positive squares in only one way, i.e., 50260707721 + 764522500 = 224189^2 + 27650^2 .

It is not a de Polignac number, because 51025230221 - 2³⁰ = 49951488397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51025230211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 520665566 + ... + 520665663.

It is an arithmetic number, because the mean of its divisors is an integer number (9892646685).

Almost surely, 2^51025230221 is an apocalyptic number.

It is an amenable number.

51025230221 is a deficient number, since it is larger than the sum of its proper divisors (8330649889).

51025230221 is a wasteful number, since it uses less digits than its factorization.

51025230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041331243 (or 1041331236 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 51025230221 its reverse (12203252015), we get a palindrome (63228482236).

The spelling of 51025230221 in words is "fifty-one billion, twenty-five million, two hundred thirty thousand, two hundred twenty-one".