21203331202212 has 12 divisors (see below), whose sum is σ = 49474439471856. Its totient is φ = 7067777067400.

The previous prime is 21203331202211. The next prime is 21203331202231. The reversal of 21203331202212 is 21220213330212.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21203331202211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 883472133414 + ... + 883472133437.

It is an arithmetic number, because the mean of its divisors is an integer number (4122869955988).

Almost surely, 2^{21203331202212} is an apocalyptic number.

It is an amenable number.

21203331202212 is an abundant number, since it is smaller than the sum of its proper divisors (28271108269644).

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

21203331202212 is a wasteful number, since it uses less digits than its factorization.

21203331202212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766944266858 (or 1766944266856 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 21203331202212 its reverse (21220213330212), we get a palindrome (42423544532424).

The spelling of 21203331202212 in words is "twenty-one trillion, two hundred three billion, three hundred thirty-one million, two hundred two thousand, two hundred twelve".