21112233210 has 24 divisors (see below), whose sum is σ = 54891806580. Its totient is φ = 5629928832.

The previous prime is 21112233203. The next prime is 21112233221. The reversal of 21112233210 is 1233221112.

21112233210 is a `hidden beast` number, since 211 + 12 + 233 + 210 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20840675769 + 271557441 = 144363^2 + 16479^2 .

It is a super-2 number, since 2×21112233210² (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 (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117290095 + ... + 117290274.

Almost surely, 2^21112233210 is an apocalyptic number.

21112233210 is an abundant number, since it is smaller than the sum of its proper divisors (33779573370).

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

21112233210 is a wasteful number, since it uses less digits than its factorization.

21112233210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234580382 (or 234580379 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21112233210 its reverse (1233221112), we get a palindrome (22345454322).

The spelling of 21112233210 in words is "twenty-one billion, one hundred twelve million, two hundred thirty-three thousand, two hundred ten".