521521252000 has 192 divisors, whose sum is σ = 1471880906496. Its totient is φ = 177897753600.

The previous prime is 521521251931. The next prime is 521521252009. The reversal of 521521252000 is 252125125.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (521521252009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5468727 + ... + 5563273.

It is an arithmetic number, because the mean of its divisors is an integer number (7666046388).

Almost surely, 2^521521252000 is an apocalyptic number.

521521252000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521521252000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (735940453248).

521521252000 is an abundant number, since it is smaller than the sum of its proper divisors (950359654496).

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

521521252000 is a wasteful number, since it uses less digits than its factorization.

521521252000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94776 (or 94758 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 25.

Adding to 521521252000 its reverse (252125125), we get a palindrome (521773377125).

The spelling of 521521252000 in words is "five hundred twenty-one billion, five hundred twenty-one million, two hundred fifty-two thousand".