21111112303 has 2 divisors, whose sum is σ = 21111112304. Its totient is φ = 21111112302.

The previous prime is 21111112289. The next prime is 21111112331. The reversal of 21111112303 is 30321111112.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21111112303 - 2⁵ = 21111112271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21111182303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10555556151 + 10555556152.

It is an arithmetic number, because the mean of its divisors is an integer number (10555556152).

Almost surely, 2^21111112303 is an apocalyptic number.

21111112303 is a deficient number, since it is larger than the sum of its proper divisors (1).

21111112303 is an equidigital number, since it uses as much as digits as its factorization.

21111112303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21111112303 its reverse (30321111112), we get a palindrome (51432223415).

It can be divided in two parts, 21111112 and 303, that multiplied together give a palindrome (6396666936).

The spelling of 21111112303 in words is "twenty-one billion, one hundred eleven million, one hundred twelve thousand, three hundred three".