21201607 has 8 divisors (see below), whose sum is σ = 25284096. Its totient is φ = 17382552.

The previous prime is 21201599. The next prime is 21201611. The reversal of 21201607 is 70610212.

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 21201607 - 2³ = 21201599 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 (21201637) 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 7 ways as a sum of consecutive naturals, for example, 65683 + ... + 66004.

It is an arithmetic number, because the mean of its divisors is an integer number (3160512).

Almost surely, 2^21201607 is an apocalyptic number.

21201607 is a deficient number, since it is larger than the sum of its proper divisors (4082489).

21201607 is a wasteful number, since it uses less digits than its factorization.

21201607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131717.

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 21201607 is about 4604.5202790302. The cubic root of 21201607 is about 276.7724936679.

Adding to 21201607 its reverse (70610212), we get a palindrome (91811819).

The spelling of 21201607 in words is "twenty-one million, two hundred one thousand, six hundred seven".