22101210 has 48 divisors (see below), whose sum is σ = 59025096. Its totient is φ = 5733504.

The previous prime is 22101193. The next prime is 22101239. The reversal of 22101210 is 1210122.

It can be written as a sum of positive squares in 4 ways, for example, as 15705369 + 6395841 = 3963^2 + 2529^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 22101192 and 22101201.

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 23 ways as a sum of consecutive naturals, for example, 12 + ... + 6648.

Almost surely, 2^22101210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22101210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29512548).

22101210 is an abundant number, since it is smaller than the sum of its proper divisors (36923886).

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

22101210 is a wasteful number, since it uses less digits than its factorization.

22101210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6687 (or 6684 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 22101210 is about 4701.1924019338. The cubic root of 22101210 is about 280.6329643095.

Adding to 22101210 its reverse (1210122), we get a palindrome (23311332).

The spelling of 22101210 in words is "twenty-two million, one hundred one thousand, two hundred ten".