21112203503 has 2 divisors, whose sum is σ = 21112203504. Its totient is φ = 21112203502.

The previous prime is 21112203499. The next prime is 21112203643. The reversal of 21112203503 is 30530221112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112203503 - 2² = 21112203499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112203403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556101751 + 10556101752.

It is an arithmetic number, because the mean of its divisors is an integer number (10556101752).

Almost surely, 2^21112203503 is an apocalyptic number.

21112203503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112203503 is an equidigital number, since it uses as much as digits as its factorization.

21112203503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

Adding to 21112203503 its reverse (30530221112), we get a palindrome (51642424615).

The spelling of 21112203503 in words is "twenty-one billion, one hundred twelve million, two hundred three thousand, five hundred three".