21631107 has 8 divisors (see below), whose sum is σ = 29512384. Its totient is φ = 14085288.

The previous prime is 21631081. The next prime is 21631121. The reversal of 21631107 is 70113612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21631107 - 2¹¹ = 21629059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21631007) 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, 83713 + ... + 83970.

It is an arithmetic number, because the mean of its divisors is an integer number (3689048).

Almost surely, 2^21631107 is an apocalyptic number.

21631107 is a deficient number, since it is larger than the sum of its proper divisors (7881277).

21631107 is a wasteful number, since it uses less digits than its factorization.

21631107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167729.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 21631107 is about 4650.9253917903. The cubic root of 21631107 is about 278.6289565421.

Adding to 21631107 its reverse (70113612), we get a palindrome (91744719).

The spelling of 21631107 in words is "twenty-one million, six hundred thirty-one thousand, one hundred seven".