21201111100212 has 12 divisors (see below), whose sum is σ = 49469259233856. Its totient is φ = 7067037033400.

The previous prime is 21201111100139. The next prime is 21201111100219. The reversal of 21201111100212 is 21200111110212.

It is a happy number.

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

It is a super-2 number, since 2×21201111100212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201111100191 and 21201111100200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201111100219) 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, 883379629164 + ... + 883379629187.

It is an arithmetic number, because the mean of its divisors is an integer number (4122438269488).

Almost surely, 2^{21201111100212} is an apocalyptic number.

It is an amenable number.

21201111100212 is an abundant number, since it is smaller than the sum of its proper divisors (28268148133644).

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

21201111100212 is a wasteful number, since it uses less digits than its factorization.

21201111100212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766759258358 (or 1766759258356 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201111100212 its reverse (21200111110212), we get a palindrome (42401222210424).

The spelling of 21201111100212 in words is "twenty-one trillion, two hundred one billion, one hundred eleven million, one hundred thousand, two hundred twelve".