63073521221 has 4 divisors (see below), whose sum is σ = 63078580812. Its totient is φ = 63068461632.

The previous prime is 63073521197. The next prime is 63073521257. The reversal of 63073521221 is 12212537036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20195536321 + 42877984900 = 142111^2 + 207070^2 .

It is a cyclic number.

It is not a de Polignac number, because 63073521221 - 2³⁰ = 61999779397 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 (63073521421) 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, 2511050 + ... + 2536043.

It is an arithmetic number, because the mean of its divisors is an integer number (15769645203).

Almost surely, 2^63073521221 is an apocalyptic number.

It is an amenable number.

63073521221 is a deficient number, since it is larger than the sum of its proper divisors (5059591).

63073521221 is a wasteful number, since it uses less digits than its factorization.

63073521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5059590.

The product of its (nonzero) digits is 15120, while the sum is 32.

The spelling of 63073521221 in words is "sixty-three billion, seventy-three million, five hundred twenty-one thousand, two hundred twenty-one".