521130525420 has 48 divisors (see below), whose sum is σ = 1494754879968. Its totient is φ = 135578672640.

The previous prime is 521130525373. The next prime is 521130525437. The reversal of 521130525420 is 24525031125.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 105918379 + ... + 105923298.

It is an arithmetic number, because the mean of its divisors is an integer number (31140726666).

Almost surely, 2^521130525420 is an apocalyptic number.

It is an amenable number.

521130525420 is an abundant number, since it is smaller than the sum of its proper divisors (973624354548).

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

521130525420 is a wasteful number, since it uses less digits than its factorization.

521130525420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211841730 (or 211841728 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 521130525420 its reverse (24525031125), we get a palindrome (545655556545).

The spelling of 521130525420 in words is "five hundred twenty-one billion, one hundred thirty million, five hundred twenty-five thousand, four hundred twenty".