21113112122212 has 12 divisors (see below), whose sum is σ = 40306850415216. Its totient is φ = 9596869146440.

The previous prime is 21113112122173. The next prime is 21113112122303. The reversal of 21113112122212 is 21222121131112.

It is a Harshad number since it is a multiple of its sum of digits (22).

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, 239921728618 + ... + 239921728705.

It is an arithmetic number, because the mean of its divisors is an integer number (3358904201268).

Almost surely, 2^{21113112122212} is an apocalyptic number.

21113112122212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21113112122212 is a deficient number, since it is larger than the sum of its proper divisors (19193738293004).

21113112122212 is a wasteful number, since it uses less digits than its factorization.

21113112122212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479843457338 (or 479843457336 counting only the distinct ones).

The product of its digits is 192, while the sum is 22.

Adding to 21113112122212 its reverse (21222121131112), we get a palindrome (42335233253324).

The spelling of 21113112122212 in words is "twenty-one trillion, one hundred thirteen billion, one hundred twelve million, one hundred twenty-two thousand, two hundred twelve".