21201212100213 has 24 divisors (see below), whose sum is σ = 31386782650080. Its totient is φ = 13783137469920.

The previous prime is 21201212100181. The next prime is 21201212100247. The reversal of 21201212100213 is 31200121210212.

21201212100213 is a `hidden beast` number, since 2 + 120 + 121 + 210 + 0 + 213 = 666.

It is not a de Polignac number, because 21201212100213 - 2⁵ = 21201212100181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201212100713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44012058 + ... + 44491163.

It is an arithmetic number, because the mean of its divisors is an integer number (1307782610420).

Almost surely, 2^{21201212100213} is an apocalyptic number.

It is an amenable number.

21201212100213 is a deficient number, since it is larger than the sum of its proper divisors (10185570549867).

21201212100213 is a wasteful number, since it uses less digits than its factorization.

21201212100213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88503889 (or 88503886 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21201212100213 its reverse (31200121210212), we get a palindrome (52401333310425).

The spelling of 21201212100213 in words is "twenty-one trillion, two hundred one billion, two hundred twelve million, one hundred thousand, two hundred thirteen".