51221617372 has 48 divisors (see below), whose sum is σ = 100466926560. Its totient is φ = 22731835392.

The previous prime is 51221617327. The next prime is 51221617411. The reversal of 51221617372 is 27371612215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217233 + ... + 386824.

It is an arithmetic number, because the mean of its divisors is an integer number (2093060970).

Almost surely, 2^51221617372 is an apocalyptic number.

It is an amenable number.

51221617372 is a deficient number, since it is larger than the sum of its proper divisors (49245309188).

51221617372 is a wasteful number, since it uses less digits than its factorization.

51221617372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604150 (or 604148 counting only the distinct ones).

The product of its digits is 35280, while the sum is 37.

The spelling of 51221617372 in words is "fifty-one billion, two hundred twenty-one million, six hundred seventeen thousand, three hundred seventy-two".