521142504444 has 36 divisors (see below), whose sum is σ = 1320037480944. Its totient is φ = 173357459712.

The previous prime is 521142504439. The next prime is 521142504527. The reversal of 521142504444 is 444405241125.

521142504444 is a `hidden beast` number, since 5 + 2 + 1 + 142 + 504 + 4 + 4 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 521142504399 and 521142504408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14845077 + ... + 14880140.

It is an arithmetic number, because the mean of its divisors is an integer number (36667707804).

Almost surely, 2^521142504444 is an apocalyptic number.

It is an amenable number.

521142504444 is an abundant number, since it is smaller than the sum of its proper divisors (798894976500).

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

521142504444 is a wasteful number, since it uses less digits than its factorization.

521142504444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29725714 (or 29725709 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 36.

Adding to 521142504444 its reverse (444405241125), we get a palindrome (965547745569).

The spelling of 521142504444 in words is "five hundred twenty-one billion, one hundred forty-two million, five hundred four thousand, four hundred forty-four".