21202120200212 has 24 divisors (see below), whose sum is σ = 43438490168640. Its totient is φ = 8864997992640.

The previous prime is 21202120200167. The next prime is 21202120200221. The reversal of 21202120200212 is 21200202120212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9234371762 + ... + 9234374057.

It is an arithmetic number, because the mean of its divisors is an integer number (1809937090360).

Almost surely, 2^{21202120200212} is an apocalyptic number.

It is an amenable number.

21202120200212 is an abundant number, since it is smaller than the sum of its proper divisors (22236369968428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21202120200212 is a wasteful number, since it uses less digits than its factorization.

21202120200212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18468745871 (or 18468745869 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21202120200212 its reverse (21200202120212), we get a palindrome (42402322320424).

The spelling of 21202120200212 in words is "twenty-one trillion, two hundred two billion, one hundred twenty million, two hundred thousand, two hundred twelve".