21032007 has 16 divisors (see below), whose sum is σ = 28673760. Its totient is φ = 13708800.

The previous prime is 21032003. The next prime is 21032023. The reversal of 21032007 is 70023012.

It is not a de Polignac number, because 21032007 - 2² = 21032003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51219 + ... + 51627.

It is an arithmetic number, because the mean of its divisors is an integer number (1792110).

Almost surely, 2^21032007 is an apocalyptic number.

21032007 is a deficient number, since it is larger than the sum of its proper divisors (7641753).

21032007 is a wasteful number, since it uses less digits than its factorization.

21032007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 21032007 is about 4586.0666153034. The cubic root of 21032007 is about 276.0325129730.

Adding to 21032007 its reverse (70023012), we get a palindrome (91055019).

The spelling of 21032007 in words is "twenty-one million, thirty-two thousand, seven".