21063427 has 8 divisors (see below), whose sum is σ = 26260992. Its totient is φ = 16413000.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063427 is 72436012.

It is an interprime number because it is at equal distance from previous prime (21063403) and next prime (21063451).

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21063427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21063227) 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, 136699 + ... + 136852.

It is an arithmetic number, because the mean of its divisors is an integer number (3282624).

Almost surely, 2^21063427 is an apocalyptic number.

21063427 is a deficient number, since it is larger than the sum of its proper divisors (5197565).

21063427 is a wasteful number, since it uses less digits than its factorization.

21063427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273569.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 21063427 is about 4589.4909303756. The cubic root of 21063427 is about 276.1699008166.

Adding to 21063427 its reverse (72436012), we get a palindrome (93499439).

The spelling of 21063427 in words is "twenty-one million, sixty-three thousand, four hundred twenty-seven".