520522522021 has 8 divisors (see below), whose sum is σ = 527110030944. Its totient is φ = 513942540720.

The previous prime is 520522521989. The next prime is 520522522031. The reversal of 520522522021 is 120225225025.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 520522522021 - 2⁵ = 520522521989 is a prime.

It is a super-2 number, since 2×520522522021² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520522522031) 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, 1742670 + ... + 2019391.

It is an arithmetic number, because the mean of its divisors is an integer number (65888753868).

Almost surely, 2^520522522021 is an apocalyptic number.

It is an amenable number.

520522522021 is a deficient number, since it is larger than the sum of its proper divisors (6587508923).

520522522021 is a wasteful number, since it uses less digits than its factorization.

520522522021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3763811.

The product of its (nonzero) digits is 8000, while the sum is 28.

Adding to 520522522021 its reverse (120225225025), we get a palindrome (640747747046).

The spelling of 520522522021 in words is "five hundred twenty billion, five hundred twenty-two million, five hundred twenty-two thousand, twenty-one".