21203103121343 has 48 divisors (see below), whose sum is σ = 26590137753600. Its totient is φ = 16701983101440.

The previous prime is 21203103121303. The next prime is 21203103121367. The reversal of 21203103121343 is 34312130130212.

It is a happy number.

It is not a de Polignac number, because 21203103121343 - 2⁸ = 21203103121087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203103121303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11092418 + ... + 12862656.

It is an arithmetic number, because the mean of its divisors is an integer number (553961203200).

Almost surely, 2^{21203103121343} is an apocalyptic number.

21203103121343 is a deficient number, since it is larger than the sum of its proper divisors (5387034632257).

21203103121343 is a wasteful number, since it uses less digits than its factorization.

21203103121343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770672 (or 1770659 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 21203103121343 its reverse (34312130130212), we get a palindrome (55515233251555).

The spelling of 21203103121343 in words is "twenty-one trillion, two hundred three billion, one hundred three million, one hundred twenty-one thousand, three hundred forty-three".