21100002221212 has 12 divisors (see below), whose sum is σ = 36925084755720. Its totient is φ = 10549978005296.

The previous prime is 21100002221201. The next prime is 21100002221257. The reversal of 21100002221212 is 21212220000112.

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 3 ways as a sum of consecutive naturals, for example, 3633262 + ... + 7443157.

It is an arithmetic number, because the mean of its divisors is an integer number (3077090396310).

Almost surely, 2^{21100002221212} is an apocalyptic number.

It is an amenable number.

21100002221212 is a deficient number, since it is larger than the sum of its proper divisors (15825082534508).

21100002221212 is a wasteful number, since it uses less digits than its factorization.

21100002221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11552660 (or 11552658 counting only the distinct ones).

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

Adding to 21100002221212 its reverse (21212220000112), we get a palindrome (42312222221324).

The spelling of 21100002221212 in words is "twenty-one trillion, one hundred billion, two million, two hundred twenty-one thousand, two hundred twelve".