21332147 has 4 divisors (see below), whose sum is σ = 21353496. Its totient is φ = 21310800.

The previous prime is 21332141. The next prime is 21332153. The reversal of 21332147 is 74123312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21332141) and next prime (21332153).

It is a cyclic number.

It is not a de Polignac number, because 21332147 - 2¹⁶ = 21266611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9098 + ... + 11199.

It is an arithmetic number, because the mean of its divisors is an integer number (5338374).

Almost surely, 2^21332147 is an apocalyptic number.

21332147 is a deficient number, since it is larger than the sum of its proper divisors (21349).

21332147 is a wasteful number, since it uses less digits than its factorization.

21332147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21348.

The product of its digits is 1008, while the sum is 23.

The square root of 21332147 is about 4618.6737273811. The cubic root of 21332147 is about 277.3393686600.

Adding to 21332147 its reverse (74123312), we get a palindrome (95455459).

The spelling of 21332147 in words is "twenty-one million, three hundred thirty-two thousand, one hundred forty-seven".