22121210212 has 6 divisors (see below), whose sum is σ = 38712117878. Its totient is φ = 11060605104.

The previous prime is 22121210197. The next prime is 22121210213. The reversal of 22121210212 is 21201212122.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11426754816 + 10694455396 = 106896^2 + 103414^2 .

It is not an unprimeable number, because it can be changed into a prime (22121210213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2765151273 + ... + 2765151280.

Almost surely, 2^22121210212 is an apocalyptic number.

It is an amenable number.

22121210212 is a deficient number, since it is larger than the sum of its proper divisors (16590907666).

22121210212 is a wasteful number, since it uses less digits than its factorization.

22121210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5530302557 (or 5530302555 counting only the distinct ones).

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

Adding to 22121210212 its reverse (21201212122), we get a palindrome (43322422334).

The spelling of 22121210212 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, two hundred twelve".