21132147 has 8 divisors (see below), whose sum is σ = 29401344. Its totient is φ = 13475528.

The previous prime is 21132131. The next prime is 21132191. The reversal of 21132147 is 74123112.

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 21132147 - 2⁴ = 21132131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21132127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 153063 + ... + 153200.

It is an arithmetic number, because the mean of its divisors is an integer number (3675168).

Almost surely, 2^21132147 is an apocalyptic number.

21132147 is a deficient number, since it is larger than the sum of its proper divisors (8269197).

21132147 is a wasteful number, since it uses less digits than its factorization.

21132147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306289.

The product of its digits is 336, while the sum is 21.

The square root of 21132147 is about 4596.9715030659. The cubic root of 21132147 is about 276.4699120435.

Adding to 21132147 its reverse (74123112), we get a palindrome (95255259).

The spelling of 21132147 in words is "twenty-one million, one hundred thirty-two thousand, one hundred forty-seven".