63321520821 has 8 divisors (see below), whose sum is σ = 90923209440. Its totient is φ = 38967089712.

The previous prime is 63321520781. The next prime is 63321520849. The reversal of 63321520821 is 12802512336.

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

It is not a de Polignac number, because 63321520821 - 2¹¹ = 63321518773 is a prime.

It is a super-2 number, since 2×63321520821² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63321520861) 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, 811814331 + ... + 811814408.

It is an arithmetic number, because the mean of its divisors is an integer number (11365401180).

Almost surely, 2^63321520821 is an apocalyptic number.

It is an amenable number.

63321520821 is a deficient number, since it is larger than the sum of its proper divisors (27601688619).

63321520821 is a wasteful number, since it uses less digits than its factorization.

63321520821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623628755.

The product of its (nonzero) digits is 17280, while the sum is 33.

The spelling of 63321520821 in words is "sixty-three billion, three hundred twenty-one million, five hundred twenty thousand, eight hundred twenty-one".