21102130101 has 32 divisors (see below), whose sum is σ = 30688237440. Its totient is φ = 12820414464.

The previous prime is 21102130087. The next prime is 21102130177. The reversal of 21102130101 is 10103120112.

It is not a de Polignac number, because 21102130101 - 2¹⁹ = 21101605813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21102130501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1578421 + ... + 1591733.

It is an arithmetic number, because the mean of its divisors is an integer number (959007420).

Almost surely, 2^21102130101 is an apocalyptic number.

It is an amenable number.

21102130101 is a deficient number, since it is larger than the sum of its proper divisors (9586107339).

21102130101 is a wasteful number, since it uses less digits than its factorization.

21102130101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13845.

The product of its (nonzero) digits is 12, while the sum is 12.

Adding to 21102130101 its reverse (10103120112), we get a palindrome (31205250213).

The spelling of 21102130101 in words is "twenty-one billion, one hundred two million, one hundred thirty thousand, one hundred one".