210021100100101 has 16 divisors (see below), whose sum is σ = 214697785492224. Its totient is φ = 205353183619584.

The previous prime is 210021100100099. The next prime is 210021100100107. The reversal of 210021100100101 is 101001001120012.

It is a cyclic number.

It is not a de Polignac number, because 210021100100101 - 2¹ = 210021100100099 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 (210021100100107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201687886 + ... + 202726528.

It is an arithmetic number, because the mean of its divisors is an integer number (13418611593264).

Almost surely, 2^{210021100100101} is an apocalyptic number.

It is an amenable number.

210021100100101 is a deficient number, since it is larger than the sum of its proper divisors (4676685392123).

210021100100101 is a wasteful number, since it uses less digits than its factorization.

210021100100101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042860.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 210021100100101 its reverse (101001001120012), we get a palindrome (311022101220113).

The spelling of 210021100100101 in words is "two hundred ten trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred one".