1220442212221 has 4 divisors (see below), whose sum is σ = 1220454321244. Its totient is φ = 1220430103200.

The previous prime is 1220442212183. The next prime is 1220442212267. The reversal of 1220442212221 is 1222122440221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 708945476121 + 511496736100 = 841989^2 + 715190^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220442212221 - 2¹¹ = 1220442210173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220442212281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5902050 + ... + 6105331.

It is an arithmetic number, because the mean of its divisors is an integer number (305113580311).

Almost surely, 2^{1220442212221} is an apocalyptic number.

It is an amenable number.

1220442212221 is a deficient number, since it is larger than the sum of its proper divisors (12109023).

1220442212221 is a wasteful number, since it uses less digits than its factorization.

1220442212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109022.

The product of its (nonzero) digits is 2048, while the sum is 25.

Adding to 1220442212221 its reverse (1222122440221), we get a palindrome (2442564652442).

The spelling of 1220442212221 in words is "one trillion, two hundred twenty billion, four hundred forty-two million, two hundred twelve thousand, two hundred twenty-one".