521401320 has 128 divisors (see below), whose sum is σ = 1896048000. Its totient is φ = 126397440.

The previous prime is 521401319. The next prime is 521401327. The reversal of 521401320 is 23104125.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 521401293 and 521401302.

It is not an unprimeable number, because it can be changed into a prime (521401327) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10065 + ... + 33824.

It is an arithmetic number, because the mean of its divisors is an integer number (14812875).

Almost surely, 2^521401320 is an apocalyptic number.

It is an amenable number.

521401320 is an abundant number, since it is smaller than the sum of its proper divisors (1374646680).

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

521401320 is a wasteful number, since it uses less digits than its factorization.

521401320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43920 (or 43910 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 521401320 is about 22834.2138029756. The cubic root of 521401320 is about 804.8668529707.

Adding to 521401320 its reverse (23104125), we get a palindrome (544505445).

The spelling of 521401320 in words is "five hundred twenty-one million, four hundred one thousand, three hundred twenty".