521023120 has 20 divisors (see below), whose sum is σ = 1211378940. Its totient is φ = 208409216.

The previous prime is 521023109. The next prime is 521023201. The reversal of 521023120 is 21320125.

It can be written as a sum of positive squares in 2 ways, for example, as 63234304 + 457788816 = 7952^2 + 21396^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 521023094 and 521023103.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3256315 + ... + 3256474.

It is an arithmetic number, because the mean of its divisors is an integer number (60568947).

Almost surely, 2^521023120 is an apocalyptic number.

It is an amenable number.

521023120 is an abundant number, since it is smaller than the sum of its proper divisors (690355820).

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

521023120 is a wasteful number, since it uses less digits than its factorization.

521023120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6512802 (or 6512796 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 521023120 is about 22825.9308682034. The cubic root of 521023120 is about 804.6722017100.

Adding to 521023120 its reverse (21320125), we get a palindrome (542343245).

The spelling of 521023120 in words is "five hundred twenty-one million, twenty-three thousand, one hundred twenty".