51522420000 has 120 divisors (see below), whose sum is σ = 169004038896. Its totient is φ = 13739296000.

The previous prime is 51522419999. The next prime is 51522420011. The reversal of 51522420000 is 2422515.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 369354 + ... + 489353.

Almost surely, 2^51522420000 is an apocalyptic number.

51522420000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

51522420000 is an abundant number, since it is smaller than the sum of its proper divisors (117481618896).

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

51522420000 is an equidigital number, since it uses as much as digits as its factorization.

51522420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858740 (or 858717 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

Adding to 51522420000 its reverse (2422515), we get a palindrome (51524842515).

The spelling of 51522420000 in words is "fifty-one billion, five hundred twenty-two million, four hundred twenty thousand".