21021201100101 has 64 divisors (see below), whose sum is σ = 29389135620096. Its totient is φ = 13352289350400.

The previous prime is 21021201100051. The next prime is 21021201100127. The reversal of 21021201100101 is 10100110212012.

It is not a de Polignac number, because 21021201100101 - 2¹⁴ = 21021201083717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021201100001) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2449733631 + ... + 2449742211.

It is an arithmetic number, because the mean of its divisors is an integer number (459205244064).

Almost surely, 2^{21021201100101} is an apocalyptic number.

It is an amenable number.

21021201100101 is a deficient number, since it is larger than the sum of its proper divisors (8367934519995).

21021201100101 is a wasteful number, since it uses less digits than its factorization.

21021201100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762.

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

Adding to 21021201100101 its reverse (10100110212012), we get a palindrome (31121311312113).

The spelling of 21021201100101 in words is "twenty-one trillion, twenty-one billion, two hundred one million, one hundred thousand, one hundred one".