21112212022110 has 384 divisors, whose sum is σ = 64234575894528. Its totient is φ = 4754308608000.

The previous prime is 21112212022091. The next prime is 21112212022133. The reversal of 21112212022110 is 1122021221112.

21112212022110 is a `hidden beast` number, since 21 + 11 + 221 + 202 + 211 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 487997880 + ... + 488041140.

It is an arithmetic number, because the mean of its divisors is an integer number (167277541392).

Almost surely, 2^{21112212022110} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21112212022110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32117287947264).

21112212022110 is an abundant number, since it is smaller than the sum of its proper divisors (43122363872418).

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

21112212022110 is a wasteful number, since it uses less digits than its factorization.

21112212022110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43680 (or 43677 counting only the distinct ones).

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

Adding to 21112212022110 its reverse (1122021221112), we get a palindrome (22234233243222).

The spelling of 21112212022110 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, twenty-two thousand, one hundred ten".