21121222010112 has 144 divisors (see below), whose sum is σ = 71381907882880. Its totient is φ = 6034634846208.

The previous prime is 21121222010087. The next prime is 21121222010113. The reversal of 21121222010112 is 21101022212112.

21121222010112 is a `hidden beast` number, since 211 + 212 + 220 + 10 + 1 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a super-2 number, since 2×21121222010112² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121222010113) 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, 218218213 + ... + 218314980.

Almost surely, 2^{21121222010112} is an apocalyptic number.

It is an amenable number.

21121222010112 is an abundant number, since it is smaller than the sum of its proper divisors (50260685872768).

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

21121222010112 is an equidigital number, since it uses as much as digits as its factorization.

21121222010112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436533225 (or 436533205 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21121222010112 its reverse (21101022212112), we get a palindrome (42222244222224).

The spelling of 21121222010112 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-two million, ten thousand, one hundred twelve".