21163147 has 8 divisors (see below), whose sum is σ = 22481712. Its totient is φ = 19852800.

The previous prime is 21163141. The next prime is 21163159. The reversal of 21163147 is 74136112.

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 21163147 - 2³ = 21163139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163141) 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, 3747 + ... + 7507.

It is an arithmetic number, because the mean of its divisors is an integer number (2810214).

Almost surely, 2^21163147 is an apocalyptic number.

21163147 is a deficient number, since it is larger than the sum of its proper divisors (1318565).

21163147 is a wasteful number, since it uses less digits than its factorization.

21163147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4109.

The product of its digits is 1008, while the sum is 25.

The square root of 21163147 is about 4600.3420525000. The cubic root of 21163147 is about 276.6050360294.

Adding to 21163147 its reverse (74136112), we get a palindrome (95299259).

The spelling of 21163147 in words is "twenty-one million, one hundred sixty-three thousand, one hundred forty-seven".