521000042 has 8 divisors (see below), whose sum is σ = 781598532. Its totient is φ = 260467200.

The previous prime is 521000033. The next prime is 521000069. The reversal of 521000042 is 240000125.

It can be written as a sum of positive squares in 2 ways, for example, as 519338521 + 1661521 = 22789^2 + 1289^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 520999990 and 521000026.

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, 17192 + ... + 36572.

Almost surely, 2^521000042 is an apocalyptic number.

521000042 is a deficient number, since it is larger than the sum of its proper divisors (260598490).

521000042 is a wasteful number, since it uses less digits than its factorization.

521000042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32824.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 521000042 is about 22825.4253410533. The cubic root of 521000042 is about 804.6603209197.

Adding to 521000042 its reverse (240000125), we get a palindrome (761000167).

The spelling of 521000042 in words is "five hundred twenty-one million, forty-two", and thus it is an aban number.