63415021 has 4 divisors (see below), whose sum is σ = 63459100. Its totient is φ = 63370944.

The previous prime is 63415019. The next prime is 63415043. The reversal of 63415021 is 12051436.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10692900 + 52722121 = 3270^2 + 7261^2 .

It is a cyclic number.

It is not a de Polignac number, because 63415021 - 2¹ = 63415019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63414983 and 63415001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63415061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19806 + ... + 22783.

It is an arithmetic number, because the mean of its divisors is an integer number (15864775).

Almost surely, 2^63415021 is an apocalyptic number.

It is an amenable number.

63415021 is a deficient number, since it is larger than the sum of its proper divisors (44079).

63415021 is a wasteful number, since it uses less digits than its factorization.

63415021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44078.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 63415021 is about 7963.3548834646. The cubic root of 63415021 is about 398.7775616670. Note that the first 3 decimals are identical.

Adding to 63415021 its reverse (12051436), we get a palindrome (75466457).

The spelling of 63415021 in words is "sixty-three million, four hundred fifteen thousand, twenty-one".