63138021 has 16 divisors (see below), whose sum is σ = 87033984. Its totient is φ = 40682304.

The previous prime is 63138001. The next prime is 63138037. The reversal of 63138021 is 12083136.

It is not a de Polignac number, because 63138021 - 2¹¹ = 63135973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63137982 and 63138000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63138001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15616 + ... + 19238.

It is an arithmetic number, because the mean of its divisors is an integer number (5439624).

Almost surely, 2^63138021 is an apocalyptic number.

It is an amenable number.

63138021 is a deficient number, since it is larger than the sum of its proper divisors (23895963).

63138021 is a wasteful number, since it uses less digits than its factorization.

63138021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3820.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 63138021 is about 7945.9436821563. The cubic root of 63138021 is about 398.1960873943.

The spelling of 63138021 in words is "sixty-three million, one hundred thirty-eight thousand, twenty-one".