21112242210 has 24 divisors (see below), whose sum is σ = 54891829980. Its totient is φ = 5629931232.

The previous prime is 21112242209. The next prime is 21112242241. The reversal of 21112242210 is 1224221112.

21112242210 is a `hidden beast` number, since 211 + 1 + 2 + 242 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20752419249 + 359822961 = 144057^2 + 18969^2 .

It is a super-2 number, since 2×21112242210² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117290145 + ... + 117290324.

Almost surely, 2^21112242210 is an apocalyptic number.

21112242210 is an abundant number, since it is smaller than the sum of its proper divisors (33779587770).

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

21112242210 is a wasteful number, since it uses less digits than its factorization.

21112242210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234580482 (or 234580479 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21112242210 its reverse (1224221112), we get a palindrome (22336463322).

The spelling of 21112242210 in words is "twenty-one billion, one hundred twelve million, two hundred forty-two thousand, two hundred ten".