521033400021 has 8 divisors (see below), whose sum is σ = 694714571424. Its totient is φ = 347353914320.

The previous prime is 521033400011. The next prime is 521033400073. The reversal of 521033400021 is 120004330125.

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 521033400021 - 2¹⁷ = 521033268949 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521033400011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 834415 + ... + 1318451.

It is an arithmetic number, because the mean of its divisors is an integer number (86839321428).

Almost surely, 2^521033400021 is an apocalyptic number.

It is an amenable number.

521033400021 is a deficient number, since it is larger than the sum of its proper divisors (173681171403).

521033400021 is a wasteful number, since it uses less digits than its factorization.

521033400021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842851.

The product of its (nonzero) digits is 720, while the sum is 21.

Adding to 521033400021 its reverse (120004330125), we get a palindrome (641037730146).

The spelling of 521033400021 in words is "five hundred twenty-one billion, thirty-three million, four hundred thousand, twenty-one".