12120211222021 has 24 divisors (see below), whose sum is σ = 14138691364440. Its totient is φ = 10359540559872.

The previous prime is 12120211221997. The next prime is 12120211222037. The reversal of 12120211222021 is 12022211202121.

It can be written as a sum of positive squares in 4 ways, for example, as 6636605497921 + 5483605724100 = 2576161^2 + 2341710^2 .

It is not a de Polignac number, because 12120211222021 - 2¹⁵ = 12120211189253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12120211222021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12120211222121) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 55063035 + ... + 55282711.

It is an arithmetic number, because the mean of its divisors is an integer number (589112140185).

Almost surely, 2^{12120211222021} is an apocalyptic number.

It is an amenable number.

12120211222021 is a deficient number, since it is larger than the sum of its proper divisors (2018480142419).

12120211222021 is a wasteful number, since it uses less digits than its factorization.

12120211222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222853 (or 222846 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 12120211222021 its reverse (12022211202121), we get a palindrome (24142422424142).

The spelling of 12120211222021 in words is "twelve trillion, one hundred twenty billion, two hundred eleven million, two hundred twenty-two thousand, twenty-one".