21102110213 has 8 divisors (see below), whose sum is σ = 21453492216. Its totient is φ = 20750904000.

The previous prime is 21102110203. The next prime is 21102110257. The reversal of 21102110213 is 31201120112.

It can be written as a sum of positive squares in 4 ways, for example, as 471671524 + 20630438689 = 21718^2 + 143633^2 .

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 21102110213 - 2⁸ = 21102109957 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 (21102110203) 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, 210263 + ... + 293963.

It is an arithmetic number, because the mean of its divisors is an integer number (2681686527).

Almost surely, 2^21102110213 is an apocalyptic number.

It is an amenable number.

21102110213 is a deficient number, since it is larger than the sum of its proper divisors (351382003).

21102110213 is an equidigital number, since it uses as much as digits as its factorization.

21102110213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87895.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 21102110213 its reverse (31201120112), we get a palindrome (52303230325).

The spelling of 21102110213 in words is "twenty-one billion, one hundred two million, one hundred ten thousand, two hundred thirteen".