21601007 has 8 divisors (see below), whose sum is σ = 22702416. Its totient is φ = 20526912.

The previous prime is 21600991. The next prime is 21601061. The reversal of 21601007 is 70010612.

It is a happy number.

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 21601007 - 2⁴ = 21600991 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5198 + ... + 8379.

It is an arithmetic number, because the mean of its divisors is an integer number (2837802).

Almost surely, 2^21601007 is an apocalyptic number.

21601007 is a deficient number, since it is larger than the sum of its proper divisors (1101409).

21601007 is a wasteful number, since it uses less digits than its factorization.

21601007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13657.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 21601007 is about 4647.6883501371. The cubic root of 21601007 is about 278.4996578013.

Adding to 21601007 its reverse (70010612), we get a palindrome (91611619).

The spelling of 21601007 in words is "twenty-one million, six hundred one thousand, seven".