21002101210101 has 12 divisors (see below), whose sum is σ = 30779938964096. Its totient is φ = 12728546187720.

The previous prime is 21002101210099. The next prime is 21002101210133. The reversal of 21002101210101 is 10101210120012.

It is not a de Polignac number, because 21002101210101 - 2¹ = 21002101210099 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 (21002101210151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28928513701 + ... + 28928514426.

Almost surely, 2^{21002101210101} is an apocalyptic number.

It is an amenable number.

21002101210101 is a deficient number, since it is larger than the sum of its proper divisors (9777837753995).

21002101210101 is a wasteful number, since it uses less digits than its factorization.

21002101210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57857028152 (or 57857028141 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21002101210101 its reverse (10101210120012), we get a palindrome (31103311330113).

The spelling of 21002101210101 in words is "twenty-one trillion, two billion, one hundred one million, two hundred ten thousand, one hundred one".