51033201521 has 8 divisors (see below), whose sum is σ = 51873912744. Its totient is φ = 50192622720.

The previous prime is 51033201509. The next prime is 51033201671. The reversal of 51033201521 is 12510233015.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1688799025 + 49344402496 = 41095^2 + 222136^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51033201521 - 2²⁶ = 50966092657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51033201421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1014455 + ... + 1063571.

It is an arithmetic number, because the mean of its divisors is an integer number (6484239093).

Almost surely, 2^51033201521 is an apocalyptic number.

It is an amenable number.

51033201521 is a deficient number, since it is larger than the sum of its proper divisors (840711223).

51033201521 is a wasteful number, since it uses less digits than its factorization.

51033201521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66211.

The product of its (nonzero) digits is 900, while the sum is 23.

Adding to 51033201521 its reverse (12510233015), we get a palindrome (63543434536).

The spelling of 51033201521 in words is "fifty-one billion, thirty-three million, two hundred one thousand, five hundred twenty-one".