521132554021 has 4 divisors (see below), whose sum is σ = 548560583200. Its totient is φ = 493704524844.

The previous prime is 521132553971. The next prime is 521132554043. The reversal of 521132554021 is 120455231125.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-521132554021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521132554721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13714014561 + ... + 13714014598.

It is an arithmetic number, because the mean of its divisors is an integer number (137140145800).

Almost surely, 2^521132554021 is an apocalyptic number.

It is an amenable number.

521132554021 is a deficient number, since it is larger than the sum of its proper divisors (27428029179).

521132554021 is a wasteful number, since it uses less digits than its factorization.

521132554021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27428029178.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 521132554021 its reverse (120455231125), we get a palindrome (641587785146).

The spelling of 521132554021 in words is "five hundred twenty-one billion, one hundred thirty-two million, five hundred fifty-four thousand, twenty-one".