63521626221 has 16 divisors (see below), whose sum is σ = 94593717120. Its totient is φ = 42128328960.

The previous prime is 63521626163. The next prime is 63521626249. The reversal of 63521626221 is 12262612536.

63521626221 is a `hidden beast` number, since 6 + 3 + 5 + 2 + 1 + 626 + 2 + 21 = 666.

It is not a de Polignac number, because 63521626221 - 2¹³ = 63521618029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63521626121) 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 15 ways as a sum of consecutive naturals, for example, 6089745 + ... + 6100166.

It is an arithmetic number, because the mean of its divisors is an integer number (5912107320).

Almost surely, 2^63521626221 is an apocalyptic number.

It is an amenable number.

63521626221 is a deficient number, since it is larger than the sum of its proper divisors (31072090899).

63521626221 is a wasteful number, since it uses less digits than its factorization.

63521626221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12190113 (or 12190107 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The spelling of 63521626221 in words is "sixty-three billion, five hundred twenty-one million, six hundred twenty-six thousand, two hundred twenty-one".