521320401400 has 48 divisors (see below), whose sum is σ = 1225688738400. Its totient is φ = 206185140480.

The previous prime is 521320401391. The next prime is 521320401403. The reversal of 521320401400 is 4104023125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521320401403) 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 11 ways as a sum of consecutive naturals, for example, 14626032 + ... + 14661631.

It is an arithmetic number, because the mean of its divisors is an integer number (25535182050).

Almost surely, 2^521320401400 is an apocalyptic number.

521320401400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

521320401400 is an abundant number, since it is smaller than the sum of its proper divisors (704368337000).

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

521320401400 is a wasteful number, since it uses less digits than its factorization.

521320401400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29287768 (or 29287759 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 521320401400 its reverse (4104023125), we get a palindrome (525424424525).

The spelling of 521320401400 in words is "five hundred twenty-one billion, three hundred twenty million, four hundred one thousand, four hundred".