21010101103 has 8 divisors (see below), whose sum is σ = 21222789120. Its totient is φ = 20797504800.

The previous prime is 21010101097. The next prime is 21010101139. The reversal of 21010101103 is 30110101012.

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

It is a cyclic number.

It is not a de Polignac number, because 21010101103 - 2⁵ = 21010101071 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21010101103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010101503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 496701 + ... + 537337.

It is an arithmetic number, because the mean of its divisors is an integer number (2652848640).

Almost surely, 2^21010101103 is an apocalyptic number.

21010101103 is a deficient number, since it is larger than the sum of its proper divisors (212688017).

21010101103 is a wasteful number, since it uses less digits than its factorization.

21010101103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45857.

The product of its (nonzero) digits is 6, while the sum is 10.

Adding to 21010101103 its reverse (30110101012), we get a palindrome (51120202115).

Subtracting 21010101103 from its reverse (30110101012), we obtain a palindrome (9099999909).

The spelling of 21010101103 in words is "twenty-one billion, ten million, one hundred one thousand, one hundred three".