22121212210 has 16 divisors (see below), whose sum is σ = 39870519192. Its totient is φ = 8836854400.

The previous prime is 22121212181. The next prime is 22121212219. The reversal of 22121212210 is 1221212122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10720738681 + 11400473529 = 103541^2 + 106773^2 .

It is not an unprimeable number, because it can be changed into a prime (22121212219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1445821 + ... + 1461040.

Almost surely, 2^22121212210 is an apocalyptic number.

22121212210 is a deficient number, since it is larger than the sum of its proper divisors (17749306982).

22121212210 is a wasteful number, since it uses less digits than its factorization.

22121212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907629.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 22121212210 its reverse (1221212122), we get a palindrome (23342424332).

The spelling of 22121212210 in words is "twenty-two billion, one hundred twenty-one million, two hundred twelve thousand, two hundred ten".