22001021212 has 12 divisors (see below), whose sum is σ = 38505648160. Its totient is φ = 10999407456.

The previous prime is 22001021173. The next prime is 22001021213. The reversal of 22001021212 is 21212010022.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 22001021192 and 22001021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001021213) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 230073 + ... + 311344.

Almost surely, 2^22001021212 is an apocalyptic number.

It is an amenable number.

22001021212 is a deficient number, since it is larger than the sum of its proper divisors (16504626948).

22001021212 is a wasteful number, since it uses less digits than its factorization.

22001021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551580 (or 551578 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22001021212 its reverse (21212010022), we get a palindrome (43213031234).

The spelling of 22001021212 in words is "twenty-two billion, one million, twenty-one thousand, two hundred twelve".