21113122203 has 8 divisors (see below), whose sum is σ = 31278699600. Its totient is φ = 14075414784.

The previous prime is 21113122201. The next prime is 21113122231. The reversal of 21113122203 is 30222131112.

It is not a de Polignac number, because 21113122203 - 2¹ = 21113122201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21113122201) 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 in 7 ways as a sum of consecutive naturals, for example, 390983718 + ... + 390983771.

It is an arithmetic number, because the mean of its divisors is an integer number (3909837450).

Almost surely, 2^21113122203 is an apocalyptic number.

21113122203 is a deficient number, since it is larger than the sum of its proper divisors (10165577397).

21113122203 is an equidigital number, since it uses as much as digits as its factorization.

21113122203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781967498 (or 781967492 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21113122203 its reverse (30222131112), we get a palindrome (51335253315).

The spelling of 21113122203 in words is "twenty-one billion, one hundred thirteen million, one hundred twenty-two thousand, two hundred three".