63351521221 has 4 divisors (see below), whose sum is σ = 63585290944. Its totient is φ = 63117751500.

The previous prime is 63351521183. The next prime is 63351521251. The reversal of 63351521221 is 12212515336.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63351521221 - 2²¹ = 63349424069 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 (63351521251) 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 3 ways as a sum of consecutive naturals, for example, 116884455 + ... + 116884996.

It is an arithmetic number, because the mean of its divisors is an integer number (15896322736).

Almost surely, 2^63351521221 is an apocalyptic number.

It is an amenable number.

63351521221 is a deficient number, since it is larger than the sum of its proper divisors (233769723).

63351521221 is a wasteful number, since it uses less digits than its factorization.

63351521221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233769722.

The product of its digits is 10800, while the sum is 31.

The spelling of 63351521221 in words is "sixty-three billion, three hundred fifty-one million, five hundred twenty-one thousand, two hundred twenty-one".