521023212 has 48 divisors (see below), whose sum is σ = 1352243200. Its totient is φ = 173489040.

The previous prime is 521023211. The next prime is 521023219. The reversal of 521023212 is 212320125.

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

It is not an unprimeable number, because it can be changed into a prime (521023211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130989 + ... + 134907.

Almost surely, 2^521023212 is an apocalyptic number.

It is an amenable number.

521023212 is an abundant number, since it is smaller than the sum of its proper divisors (831219988).

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

521023212 is a wasteful number, since it uses less digits than its factorization.

521023212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5163 (or 5155 counting only the distinct ones).

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

The square root of 521023212 is about 22825.9328834552. The cubic root of 521023212 is about 804.6722490718.

Adding to 521023212 its reverse (212320125), we get a palindrome (733343337).

The spelling of 521023212 in words is "five hundred twenty-one million, twenty-three thousand, two hundred twelve".