21012222112212 has 48 divisors (see below), whose sum is σ = 51163536412800. Its totient is φ = 6699111247488.

The previous prime is 21012222112181. The next prime is 21012222112241. The reversal of 21012222112212 is 21221122221012.

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 15 ways as a sum of consecutive naturals, for example, 1756318 + ... + 6716330.

It is an arithmetic number, because the mean of its divisors is an integer number (1065907008600).

Almost surely, 2^{21012222112212} is an apocalyptic number.

It is an amenable number.

21012222112212 is an abundant number, since it is smaller than the sum of its proper divisors (30151314300588).

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

21012222112212 is a wasteful number, since it uses less digits than its factorization.

21012222112212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4975392 (or 4975390 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 21.

Adding to 21012222112212 its reverse (21221122221012), we get a palindrome (42233344333224).

The spelling of 21012222112212 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, one hundred twelve thousand, two hundred twelve".