21212120122112 has 72 divisors (see below), whose sum is σ = 44727367728960. Its totient is φ = 10012340966400.

The previous prime is 21212120122103. The next prime is 21212120122159. The reversal of 21212120122112 is 21122102121212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6328514 + ... + 9081537.

It is an arithmetic number, because the mean of its divisors is an integer number (621213440680).

Almost surely, 2^{21212120122112} is an apocalyptic number.

It is an amenable number.

21212120122112 is an abundant number, since it is smaller than the sum of its proper divisors (23515247606848).

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

21212120122112 is a wasteful number, since it uses less digits than its factorization.

21212120122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15410369 (or 15410355 counting only the distinct ones).

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

Adding to 21212120122112 its reverse (21122102121212), we get a palindrome (42334222243324).

Subtracting from 21212120122112 its reverse (21122102121212), we obtain a square (90018000900 = 300030²).

The spelling of 21212120122112 in words is "twenty-one trillion, two hundred twelve billion, one hundred twenty million, one hundred twenty-two thousand, one hundred twelve".