51213211351 has 4 divisors (see below), whose sum is σ = 51216341632. Its totient is φ = 51210081072.

The previous prime is 51213211337. The next prime is 51213211367. The reversal of 51213211351 is 15311231215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51213211351 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 (51213211381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1540470 + ... + 1573363.

It is an arithmetic number, because the mean of its divisors is an integer number (12804085408).

Almost surely, 2^51213211351 is an apocalyptic number.

51213211351 is a deficient number, since it is larger than the sum of its proper divisors (3130281).

51213211351 is a wasteful number, since it uses less digits than its factorization.

51213211351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3130280.

The product of its digits is 900, while the sum is 25.

Adding to 51213211351 its reverse (15311231215), we get a palindrome (66524442566).

The spelling of 51213211351 in words is "fifty-one billion, two hundred thirteen million, two hundred eleven thousand, three hundred fifty-one".