21132007 has 4 divisors (see below), whose sum is σ = 22757560. Its totient is φ = 19506456.

The previous prime is 21131989. The next prime is 21132011. The reversal of 21132007 is 70023112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21132007 - 2¹¹ = 21129959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21132077) 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 3 ways as a sum of consecutive naturals, for example, 812757 + ... + 812782.

It is an arithmetic number, because the mean of its divisors is an integer number (5689390).

Almost surely, 2^21132007 is an apocalyptic number.

21132007 is a deficient number, since it is larger than the sum of its proper divisors (1625553).

21132007 is a wasteful number, since it uses less digits than its factorization.

21132007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625552.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 21132007 is about 4596.9562756241. The cubic root of 21132007 is about 276.4693015065.

Adding to 21132007 its reverse (70023112), we get a palindrome (91155119).

The spelling of 21132007 in words is "twenty-one million, one hundred thirty-two thousand, seven".