521033400020 has 48 divisors (see below), whose sum is σ = 1250687907840. Its totient is φ = 178610344704.

The previous prime is 521033400011. The next prime is 521033400073. The reversal of 521033400020 is 20004330125.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 521033399965 and 521033400001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 544952 + ... + 1157168.

It is an arithmetic number, because the mean of its divisors is an integer number (26055998080).

Almost surely, 2^521033400020 is an apocalyptic number.

It is an amenable number.

521033400020 is an abundant number, since it is smaller than the sum of its proper divisors (729654507820).

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

521033400020 is a wasteful number, since it uses less digits than its factorization.

521033400020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 618312 (or 618310 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

Adding to 521033400020 its reverse (20004330125), we get a palindrome (541037730145).

The spelling of 521033400020 in words is "five hundred twenty-one billion, thirty-three million, four hundred thousand, twenty".