21630110107 has 4 divisors (see below), whose sum is σ = 21840111280. Its totient is φ = 21420108936.

The previous prime is 21630110081. The next prime is 21630110119. The reversal of 21630110107 is 70101103612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21630110107 - 2¹⁹ = 21629585819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21630110137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105000432 + ... + 105000637.

It is an arithmetic number, because the mean of its divisors is an integer number (5460027820).

Almost surely, 2^21630110107 is an apocalyptic number.

21630110107 is a deficient number, since it is larger than the sum of its proper divisors (210001173).

21630110107 is a wasteful number, since it uses less digits than its factorization.

21630110107 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210001172.

The product of its (nonzero) digits is 252, while the sum is 22.

Adding to 21630110107 its reverse (70101103612), we get a palindrome (91731213719).

The spelling of 21630110107 in words is "twenty-one billion, six hundred thirty million, one hundred ten thousand, one hundred seven".