1220211220221 has 12 divisors (see below), whose sum is σ = 2014316935072. Its totient is φ = 697263554376.

The previous prime is 1220211220219. The next prime is 1220211220229. The reversal of 1220211220221 is 1220221120221.

It is a happy number.

1220211220221 is a `hidden beast` number, since 1 + 220 + 2 + 1 + 1 + 220 + 221 = 666.

It is not a de Polignac number, because 1220211220221 - 2¹ = 1220211220219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220211220194 and 1220211220203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220211220229) 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, 9684215971 + ... + 9684216096.

Almost surely, 2^{1220211220221} is an apocalyptic number.

It is an amenable number.

1220211220221 is a deficient number, since it is larger than the sum of its proper divisors (794105714851).

1220211220221 is a wasteful number, since it uses less digits than its factorization.

1220211220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19368432080 (or 19368432077 counting only the distinct ones).

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

Adding to 1220211220221 its reverse (1220221120221), we get a palindrome (2440432340442).

The spelling of 1220211220221 in words is "one trillion, two hundred twenty billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-one".