63406021 has 8 divisors (see below), whose sum is σ = 76278080. Its totient is φ = 51487488.

The previous prime is 63406019. The next prime is 63406051. The reversal of 63406021 is 12060436.

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

It is a cyclic number.

It is not a de Polignac number, because 63406021 - 2¹ = 63406019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63405983 and 63406001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63406001) 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, 238236 + ... + 238501.

It is an arithmetic number, because the mean of its divisors is an integer number (9534760).

Almost surely, 2^63406021 is an apocalyptic number.

It is an amenable number.

63406021 is a deficient number, since it is larger than the sum of its proper divisors (12872059).

63406021 is a wasteful number, since it uses less digits than its factorization.

63406021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476763.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 63406021 is about 7962.7897749470. The cubic root of 63406021 is about 398.7586956434.

Adding to 63406021 its reverse (12060436), we get a palindrome (75466457).

The spelling of 63406021 in words is "sixty-three million, four hundred six thousand, twenty-one".