21112202112212 has 12 divisors (see below), whose sum is σ = 36946518695520. Its totient is φ = 10556053913496.

The previous prime is 21112202112193. The next prime is 21112202112227. The reversal of 21112202112212 is 21221120221112.

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, 10768262 + ... + 12576957.

It is an arithmetic number, because the mean of its divisors is an integer number (3078876557960).

Almost surely, 2^{21112202112212} is an apocalyptic number.

It is an amenable number.

21112202112212 is a deficient number, since it is larger than the sum of its proper divisors (15834316583308).

21112202112212 is a wasteful number, since it uses less digits than its factorization.

21112202112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23571310 (or 23571308 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 21112202112212 its reverse (21221120221112), we get a palindrome (42333322333324).

The spelling of 21112202112212 in words is "twenty-one trillion, one hundred twelve billion, two hundred two million, one hundred twelve thousand, two hundred twelve".