1020220211221 has 2 divisors, whose sum is σ = 1020220211222. Its totient is φ = 1020220211220.

The previous prime is 1020220211209. The next prime is 1020220211243. The reversal of 1020220211221 is 1221120220201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 678381202321 + 341839008900 = 823639^2 + 584670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020220211221 - 2²⁹ = 1019683340309 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020220211195 and 1020220211204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020220211281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110105610 + 510110105611.

It is an arithmetic number, because the mean of its divisors is an integer number (510110105611).

Almost surely, 2^{1020220211221} is an apocalyptic number.

It is an amenable number.

1020220211221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020220211221 is an equidigital number, since it uses as much as digits as its factorization.

1020220211221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 1020220211221 its reverse (1221120220201), we get a palindrome (2241340431422).

The spelling of 1020220211221 in words is "one trillion, twenty billion, two hundred twenty million, two hundred eleven thousand, two hundred twenty-one".