1220212112221 has 2 divisors, whose sum is σ = 1220212112222. Its totient is φ = 1220212112220.

The previous prime is 1220212112201. The next prime is 1220212112233. The reversal of 1220212112221 is 1222112120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1157476891321 + 62735220900 = 1075861^2 + 250470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220212112221 - 2¹³ = 1220212104029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220212112201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610106056110 + 610106056111.

It is an arithmetic number, because the mean of its divisors is an integer number (610106056111).

Almost surely, 2^{1220212112221} is an apocalyptic number.

It is an amenable number.

1220212112221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220212112221 is an equidigital number, since it uses as much as digits as its factorization.

1220212112221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1220212112221 its reverse (1222112120221), we get a palindrome (2442324232442).

The spelling of 1220212112221 in words is "one trillion, two hundred twenty billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".