21250011103 has 4 divisors (see below), whose sum is σ = 22368432760. Its totient is φ = 20131589448.

The previous prime is 21250011091. The next prime is 21250011127. The reversal of 21250011103 is 30111005212.

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 21250011103 - 2⁵ = 21250011071 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 (21250071103) 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, 559210800 + ... + 559210837.

It is an arithmetic number, because the mean of its divisors is an integer number (5592108190).

Almost surely, 2^21250011103 is an apocalyptic number.

21250011103 is a deficient number, since it is larger than the sum of its proper divisors (1118421657).

21250011103 is a wasteful number, since it uses less digits than its factorization.

21250011103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118421656.

The product of its (nonzero) digits is 60, while the sum is 16.

Adding to 21250011103 its reverse (30111005212), we get a palindrome (51361016315).

The spelling of 21250011103 in words is "twenty-one billion, two hundred fifty million, eleven thousand, one hundred three".