21012221122112 has 112 divisors (see below), whose sum is σ = 48784130625600. Its totient is φ = 8877601474560.

The previous prime is 21012221122097. The next prime is 21012221122117. The reversal of 21012221122112 is 21122112221012.

It is not an unprimeable number, because it can be changed into a prime (21012221122117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14110787 + ... + 15528642.

Almost surely, 2^{21012221122112} is an apocalyptic number.

21012221122112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21012221122112 is an abundant number, since it is smaller than the sum of its proper divisors (27771909503488).

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

21012221122112 is a wasteful number, since it uses less digits than its factorization.

21012221122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29639524 (or 29639514 counting only the distinct ones).

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

Adding to 21012221122112 its reverse (21122112221012), we get a palindrome (42134333343124).

The spelling of 21012221122112 in words is "twenty-one trillion, twelve billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred twelve".