521402012 has 24 divisors (see below), whose sum is σ = 923030640. Its totient is φ = 257690240.

The previous prime is 521402003. The next prime is 521402017. The reversal of 521402012 is 210204125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521402017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 242462 + ... + 244602.

It is an arithmetic number, because the mean of its divisors is an integer number (38459610).

Almost surely, 2^521402012 is an apocalyptic number.

It is an amenable number.

521402012 is a deficient number, since it is larger than the sum of its proper divisors (401628628).

521402012 is a wasteful number, since it uses less digits than its factorization.

521402012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2821 (or 2819 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 521402012 is about 22834.2289556709. The cubic root of 521402012 is about 804.8672090416.

Adding to 521402012 its reverse (210204125), we get a palindrome (731606137).

The spelling of 521402012 in words is "five hundred twenty-one million, four hundred two thousand, twelve".