51211012521 has 8 divisors (see below), whose sum is σ = 68361401920. Its totient is φ = 34100649072.

The previous prime is 51211012481. The next prime is 51211012537. The reversal of 51211012521 is 12521011215.

51211012521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51211012521 - 2⁹ = 51211012009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51211012121) 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, 10003501 + ... + 10008618.

It is an arithmetic number, because the mean of its divisors is an integer number (8545175240).

Almost surely, 2^51211012521 is an apocalyptic number.

It is an amenable number.

51211012521 is a deficient number, since it is larger than the sum of its proper divisors (17150389399).

51211012521 is a wasteful number, since it uses less digits than its factorization.

51211012521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20012975.

The product of its (nonzero) digits is 200, while the sum is 21.

Adding to 51211012521 its reverse (12521011215), we get a palindrome (63732023736).

The spelling of 51211012521 in words is "fifty-one billion, two hundred eleven million, twelve thousand, five hundred twenty-one".