1201220212221 has 6 divisors (see below), whose sum is σ = 1735095862110. Its totient is φ = 800813474808.

The previous prime is 1201220212219. The next prime is 1201220212223. The reversal of 1201220212221 is 1222120221021.

It is a happy number.

1201220212221 is a `hidden beast` number, since 1 + 201 + 220 + 21 + 2 + 221 = 666.

It is an interprime number because it is at equal distance from previous prime (1201220212219) and next prime (1201220212223).

It can be written as a sum of positive squares in only one way, i.e., 869229905625 + 331990306596 = 932325^2 + 576186^2 .

It is not a de Polignac number, because 1201220212221 - 2¹ = 1201220212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1201220212194 and 1201220212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201220212223) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66734456226 + ... + 66734456243.

It is an arithmetic number, because the mean of its divisors is an integer number (289182643685).

Almost surely, 2^{1201220212221} is an apocalyptic number.

It is an amenable number.

1201220212221 is a deficient number, since it is larger than the sum of its proper divisors (533875649889).

1201220212221 is a wasteful number, since it uses less digits than its factorization.

1201220212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133468912475 (or 133468912472 counting only the distinct ones).

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

Adding to 1201220212221 its reverse (1222120221021), we get a palindrome (2423340433242).

The spelling of 1201220212221 in words is "one trillion, two hundred one billion, two hundred twenty million, two hundred twelve thousand, two hundred twenty-one".