63138921 has 8 divisors (see below), whose sum is σ = 86143200. Its totient is φ = 41113632.

The previous prime is 63138917. The next prime is 63138923. The reversal of 63138921 is 12983136.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 63138921 - 2² = 63138917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63138923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244596 + ... + 244853.

It is an arithmetic number, because the mean of its divisors is an integer number (10767900).

Almost surely, 2^63138921 is an apocalyptic number.

It is an amenable number.

63138921 is a deficient number, since it is larger than the sum of its proper divisors (23004279).

63138921 is a wasteful number, since it uses less digits than its factorization.

63138921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489495.

The product of its digits is 7776, while the sum is 33.

The square root of 63138921 is about 7946.0003146237. Note that the first 3 decimals coincide. The cubic root of 63138921 is about 398.1979794121.

The spelling of 63138921 in words is "sixty-three million, one hundred thirty-eight thousand, nine hundred twenty-one".