21126343103 has 4 divisors (see below), whose sum is σ = 21127380120. Its totient is φ = 21125306088.

The previous prime is 21126343097. The next prime is 21126343127. The reversal of 21126343103 is 30134362112.

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

It is a cyclic number.

It is not a de Polignac number, because 21126343103 - 2⁶ = 21126343039 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 (21116343103) 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, 487325 + ... + 528902.

It is an arithmetic number, because the mean of its divisors is an integer number (5281845030).

Almost surely, 2^21126343103 is an apocalyptic number.

21126343103 is a deficient number, since it is larger than the sum of its proper divisors (1037017).

21126343103 is a wasteful number, since it uses less digits than its factorization.

21126343103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037016.

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

The spelling of 21126343103 in words is "twenty-one billion, one hundred twenty-six million, three hundred forty-three thousand, one hundred three".