63821055 has 16 divisors (see below), whose sum is σ = 102248064. Its totient is φ = 33993120.

The previous prime is 63821029. The next prime is 63821059. The reversal of 63821055 is 55012836.

It is not a de Polignac number, because 63821055 - 2⁹ = 63820543 is a prime.

It is a super-2 number, since 2×63821055² = 8146254122626050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63821059) 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, 11260 + ... + 15950.

It is an arithmetic number, because the mean of its divisors is an integer number (6390504).

Almost surely, 2^63821055 is an apocalyptic number.

63821055 is a deficient number, since it is larger than the sum of its proper divisors (38427009).

63821055 is a wasteful number, since it uses less digits than its factorization.

63821055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 63821055 is about 7988.8081088483. The cubic root of 63821055 is about 399.6268499225.

The spelling of 63821055 in words is "sixty-three million, eight hundred twenty-one thousand, fifty-five".