51200202521 has 16 divisors (see below), whose sum is σ = 56253430800. Its totient is φ = 46308587520.

The previous prime is 51200202499. The next prime is 51200202631. The reversal of 51200202521 is 12520200215.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3765540496 + 47434662025 = 61364^2 + 217795^2 .

It is not a de Polignac number, because 51200202521 - 2¹⁰ = 51200201497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51200202493 and 51200202502.

It is not an unprimeable number, because it can be changed into a prime (51200202121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 475505 + ... + 573153.

It is an arithmetic number, because the mean of its divisors is an integer number (3515839425).

Almost surely, 2^51200202521 is an apocalyptic number.

It is an amenable number.

51200202521 is a deficient number, since it is larger than the sum of its proper divisors (5053228279).

51200202521 is a wasteful number, since it uses less digits than its factorization.

51200202521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98476.

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51200202521 its reverse (12520200215), we get a palindrome (63720402736).

The spelling of 51200202521 in words is "fifty-one billion, two hundred million, two hundred two thousand, five hundred twenty-one".