21322007 has 6 divisors (see below), whose sum is σ = 24803208. Its totient is φ = 18275964.

The previous prime is 21322003. The next prime is 21322019. The reversal of 21322007 is 70022312.

It is not a de Polignac number, because 21322007 - 2² = 21322003 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 (21322003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 217523 + ... + 217620.

It is an arithmetic number, because the mean of its divisors is an integer number (4133868).

Almost surely, 2^21322007 is an apocalyptic number.

21322007 is a deficient number, since it is larger than the sum of its proper divisors (3481201).

21322007 is an equidigital number, since it uses as much as digits as its factorization.

21322007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 435157 (or 435150 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 21322007 is about 4617.5758791816. The cubic root of 21322007 is about 277.2954182956.

Adding to 21322007 its reverse (70022312), we get a palindrome (91344319).

The spelling of 21322007 in words is "twenty-one million, three hundred twenty-two thousand, seven".