51221651936 has 48 divisors (see below), whose sum is σ = 124114009824. Its totient is φ = 20263509504.

The previous prime is 51221651917. The next prime is 51221651951. The reversal of 51221651936 is 63915612215.

It is a super-3 number, since 3×51221651936³ (a number of 33 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51221651893 and 51221651902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8792015 + ... + 8797838.

It is an arithmetic number, because the mean of its divisors is an integer number (2585708538).

Almost surely, 2^51221651936 is an apocalyptic number.

51221651936 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

51221651936 is an abundant number, since it is smaller than the sum of its proper divisors (72892357888).

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

51221651936 is a wasteful number, since it uses less digits than its factorization.

51221651936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17589883 (or 17589875 counting only the distinct ones).

The product of its digits is 97200, while the sum is 41.

The spelling of 51221651936 in words is "fifty-one billion, two hundred twenty-one million, six hundred fifty-one thousand, nine hundred thirty-six".