21101321103 has 8 divisors (see below), whose sum is σ = 28257956400. Its totient is φ = 14006116608.

The previous prime is 21101321099. The next prime is 21101321107. The reversal of 21101321103 is 30112310112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21101321099) and next prime (21101321107).

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

It is not a de Polignac number, because 21101321103 - 2² = 21101321099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101321107) 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, 15356898 + ... + 15358271.

It is an arithmetic number, because the mean of its divisors is an integer number (3532244550).

Almost surely, 2^21101321103 is an apocalyptic number.

21101321103 is a deficient number, since it is larger than the sum of its proper divisors (7156635297).

21101321103 is a wasteful number, since it uses less digits than its factorization.

21101321103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30715401.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21101321103 its reverse (30112310112), we get a palindrome (51213631215).

The spelling of 21101321103 in words is "twenty-one billion, one hundred one million, three hundred twenty-one thousand, one hundred three".