21020121200212 has 48 divisors (see below), whose sum is σ = 38347857580032. Its totient is φ = 10074211902720.

The previous prime is 21020121200131. The next prime is 21020121200257. The reversal of 21020121200212 is 21200212102012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2753863 + ... + 7044430.

It is an arithmetic number, because the mean of its divisors is an integer number (798913699584).

Almost surely, 2^{21020121200212} is an apocalyptic number.

It is an amenable number.

21020121200212 is a deficient number, since it is larger than the sum of its proper divisors (17327736379820).

21020121200212 is a wasteful number, since it uses less digits than its factorization.

21020121200212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9798568 (or 9798566 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21020121200212 its reverse (21200212102012), we get a palindrome (42220333302224).

The spelling of 21020121200212 in words is "twenty-one trillion, twenty billion, one hundred twenty-one million, two hundred thousand, two hundred twelve".