21123200203212 has 12 divisors (see below), whose sum is σ = 49287467140856. Its totient is φ = 7041066734400.

The previous prime is 21123200203199. The next prime is 21123200203219. The reversal of 21123200203212 is 21230200232112.

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 (21123200203219) 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, 880133341789 + ... + 880133341812.

Almost surely, 2^{21123200203212} is an apocalyptic number.

It is an amenable number.

21123200203212 is an abundant number, since it is smaller than the sum of its proper divisors (28164266937644).

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

21123200203212 is a wasteful number, since it uses less digits than its factorization.

21123200203212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760266683608 (or 1760266683606 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21123200203212 its reverse (21230200232112), we get a palindrome (42353400435324).

The spelling of 21123200203212 in words is "twenty-one trillion, one hundred twenty-three billion, two hundred million, two hundred three thousand, two hundred twelve".