21630027 has 8 divisors (see below), whose sum is σ = 29834640. Its totient is φ = 13922720.

The previous prime is 21630019. The next prime is 21630031. The reversal of 21630027 is 72003612.

It is a happy number.

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 21630027 - 2³ = 21630019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21629985 and 21630012.

It is not an unprimeable number, because it can be changed into a prime (21630067) 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, 124224 + ... + 124397.

It is an arithmetic number, because the mean of its divisors is an integer number (3729330).

Almost surely, 2^21630027 is an apocalyptic number.

21630027 is a deficient number, since it is larger than the sum of its proper divisors (8204613).

21630027 is a wasteful number, since it uses less digits than its factorization.

21630027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248653.

The product of its (nonzero) digits is 504, while the sum is 21.

The square root of 21630027 is about 4650.8092844149. The cubic root of 21630027 is about 278.6243193271.

Adding to 21630027 its reverse (72003612), we get a palindrome (93633639).

The spelling of 21630027 in words is "twenty-one million, six hundred thirty thousand, twenty-seven".