51221761123416 has 64 divisors (see below), whose sum is σ = 137985436159200. Its totient is φ = 15751319635968.

The previous prime is 51221761123373. The next prime is 51221761123417. The reversal of 51221761123416 is 61432116712215.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51221761123417) 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, 47498481 + ... + 48564896.

Almost surely, 2^{51221761123416} is an apocalyptic number.

It is an amenable number.

51221761123416 is an abundant number, since it is smaller than the sum of its proper divisors (86763675035784).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51221761123416 is a wasteful number, since it uses less digits than its factorization.

51221761123416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96065108 (or 96065104 counting only the distinct ones).

The product of its digits is 120960, while the sum is 42.

The spelling of 51221761123416 in words is "fifty-one trillion, two hundred twenty-one billion, seven hundred sixty-one million, one hundred twenty-three thousand, four hundred sixteen".