21203021107 has 2 divisors, whose sum is σ = 21203021108. Its totient is φ = 21203021106.

The previous prime is 21203021093. The next prime is 21203021141. The reversal of 21203021107 is 70112030212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203021107 is a prime.

It is not a weakly prime, because it can be changed into another prime (21203021207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601510553 + 10601510554.

It is an arithmetic number, because the mean of its divisors is an integer number (10601510554).

Almost surely, 2^21203021107 is an apocalyptic number.

21203021107 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203021107 is an equidigital number, since it uses as much as digits as its factorization.

21203021107 is an odious number, because the sum of its binary digits is odd.

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

Adding to 21203021107 its reverse (70112030212), we get a palindrome (91315051319).

The spelling of 21203021107 in words is "twenty-one billion, two hundred three million, twenty-one thousand, one hundred seven".