21003112213123 has 4 divisors (see below), whose sum is σ = 21004029362448. Its totient is φ = 21002195063800.

The previous prime is 21003112213099. The next prime is 21003112213159. The reversal of 21003112213123 is 32131221130012.

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-21003112213123 is a prime.

It is a super-2 number, since 2×21003112213123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21003112213094 and 21003112213103.

It is not an unprimeable number, because it can be changed into a prime (21003112213183) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 458540311 + ... + 458586112.

It is an arithmetic number, because the mean of its divisors is an integer number (5251007340612).

Almost surely, 2^{21003112213123} is an apocalyptic number.

21003112213123 is a deficient number, since it is larger than the sum of its proper divisors (917149325).

21003112213123 is an equidigital number, since it uses as much as digits as its factorization.

21003112213123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917149324.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21003112213123 its reverse (32131221130012), we get a palindrome (53134333343135).

The spelling of 21003112213123 in words is "twenty-one trillion, three billion, one hundred twelve million, two hundred thirteen thousand, one hundred twenty-three".