21403312107 has 4 divisors (see below), whose sum is σ = 28537749480. Its totient is φ = 14268874736.

The previous prime is 21403312057. The next prime is 21403312121. The reversal of 21403312107 is 70121330412.

It is a happy number.

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 21403312107 - 2⁸ = 21403311851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21403312127) 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, 3567218682 + ... + 3567218687.

It is an arithmetic number, because the mean of its divisors is an integer number (7134437370).

Almost surely, 2^21403312107 is an apocalyptic number.

21403312107 is a deficient number, since it is larger than the sum of its proper divisors (7134437373).

21403312107 is an equidigital number, since it uses as much as digits as its factorization.

21403312107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7134437372.

The product of its (nonzero) digits is 1008, while the sum is 24.

Adding to 21403312107 its reverse (70121330412), we get a palindrome (91524642519).

The spelling of 21403312107 in words is "twenty-one billion, four hundred three million, three hundred twelve thousand, one hundred seven".