21250543103 has 8 divisors (see below), whose sum is σ = 22375380720. Its totient is φ = 20126344320.

The previous prime is 21250543049. The next prime is 21250543109. The reversal of 21250543103 is 30134505212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21250543103 - 2¹⁴ = 21250526719 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 (21250543109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90650 + ... + 225207.

It is an arithmetic number, because the mean of its divisors is an integer number (2796922590).

Almost surely, 2^21250543103 is an apocalyptic number.

21250543103 is a deficient number, since it is larger than the sum of its proper divisors (1124837617).

21250543103 is a wasteful number, since it uses less digits than its factorization.

21250543103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319417.

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 21250543103 in words is "twenty-one billion, two hundred fifty million, five hundred forty-three thousand, one hundred three".