1220222101221 has 12 divisors (see below), whose sum is σ = 1762744329580. Its totient is φ = 813388495680.

The previous prime is 1220222101187. The next prime is 1220222101229. The reversal of 1220222101221 is 1221012220221.

It is a happy number.

1220222101221 is a `hidden beast` number, since 1 + 220 + 2 + 221 + 0 + 1 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 465601522500 + 754620578721 = 682350^2 + 868689^2 .

It is not a de Polignac number, because 1220222101221 - 2⁹ = 1220222100709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220222101194 and 1220222101203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220222101229) 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, 7658866 + ... + 7816563.

Almost surely, 2^{1220222101221} is an apocalyptic number.

It is an amenable number.

1220222101221 is a deficient number, since it is larger than the sum of its proper divisors (542522228359).

1220222101221 is a wasteful number, since it uses less digits than its factorization.

1220222101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15484196 (or 15484193 counting only the distinct ones).

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

Adding to 1220222101221 its reverse (1221012220221), we get a palindrome (2441234321442).

The spelling of 1220222101221 in words is "one trillion, two hundred twenty billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty-one".