20121222272 has 32 divisors (see below), whose sum is σ = 40099575180. Its totient is φ = 10057015296.

The previous prime is 20121222271. The next prime is 20121222293. The reversal of 20121222272 is 27222212102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 19763861056 + 357361216 = 140584^2 + 18904^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (20121222271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351368 + ... + 404600.

Almost surely, 2^20121222272 is an apocalyptic number.

It is an amenable number.

20121222272 is a deficient number, since it is larger than the sum of its proper divisors (19978352908).

20121222272 is an equidigital number, since it uses as much as digits as its factorization.

20121222272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56200 (or 56188 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

Adding to 20121222272 its reverse (27222212102), we get a palindrome (47343434374).

The spelling of 20121222272 in words is "twenty billion, one hundred twenty-one million, two hundred twenty-two thousand, two hundred seventy-two".