1212202210221 has 12 divisors (see below), whose sum is σ = 1751086761372. Its totient is φ = 808075723776.

The previous prime is 1212202210201. The next prime is 1212202210223. The reversal of 1212202210221 is 1220122022121.

It is a happy number.

1212202210221 is a `hidden beast` number, since 1 + 2 + 1 + 220 + 221 + 0 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 261518709321 + 950683500900 = 511389^2 + 975030^2 .

It is not a de Polignac number, because 1212202210221 - 2¹⁴ = 1212202193837 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212202210194 and 1212202210203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212202210223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4793466 + ... + 5040011.

It is an arithmetic number, because the mean of its divisors is an integer number (145923896781).

Almost surely, 2^{1212202210221} is an apocalyptic number.

It is an amenable number.

1212202210221 is a deficient number, since it is larger than the sum of its proper divisors (538884551151).

1212202210221 is a wasteful number, since it uses less digits than its factorization.

1212202210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9847180 (or 9847177 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212202210221 its reverse (1220122022121), we get a palindrome (2432324232342).

The spelling of 1212202210221 in words is "one trillion, two hundred twelve billion, two hundred two million, two hundred ten thousand, two hundred twenty-one".