21112201212212 has 24 divisors (see below), whose sum is σ = 40458362801472. Its totient is φ = 9559966668800.

The previous prime is 21112201212181. The next prime is 21112201212253. The reversal of 21112201212212 is 21221210221112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 912198989 + ... + 912222132.

It is an arithmetic number, because the mean of its divisors is an integer number (1685765116728).

Almost surely, 2^{21112201212212} is an apocalyptic number.

21112201212212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21112201212212 is a deficient number, since it is larger than the sum of its proper divisors (19346161589260).

21112201212212 is a wasteful number, since it uses less digits than its factorization.

21112201212212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824421399 (or 1824421397 counting only the distinct ones).

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

Adding to 21112201212212 its reverse (21221210221112), we get a palindrome (42333411433324).

The spelling of 21112201212212 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, two hundred twelve thousand, two hundred twelve".