21112203423403 has 4 divisors (see below), whose sum is σ = 21112658974800. Its totient is φ = 21111747872008.

The previous prime is 21112203423397. The next prime is 21112203423419. The reversal of 21112203423403 is 30432430221112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112203423403 is a prime.

It is a super-2 number, since 2×21112203423403² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112203423463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227706175 + ... + 227798872.

It is an arithmetic number, because the mean of its divisors is an integer number (5278164743700).

Almost surely, 2^{21112203423403} is an apocalyptic number.

21112203423403 is a deficient number, since it is larger than the sum of its proper divisors (455551397).

21112203423403 is an equidigital number, since it uses as much as digits as its factorization.

21112203423403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455551396.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21112203423403 its reverse (30432430221112), we get a palindrome (51544633644515).

The spelling of 21112203423403 in words is "twenty-one trillion, one hundred twelve billion, two hundred three million, four hundred twenty-three thousand, four hundred three".