1220210123221 has 2 divisors, whose sum is σ = 1220210123222. Its totient is φ = 1220210123220.

The previous prime is 1220210123201. The next prime is 1220210123233. The reversal of 1220210123221 is 1223210120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1220207436900 + 2686321 = 1104630^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220210123221 - 2¹¹ = 1220210121173 is a prime.

It is a super-2 number, since 2×1220210123221² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220210123201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610105061610 + 610105061611.

It is an arithmetic number, because the mean of its divisors is an integer number (610105061611).

Almost surely, 2^{1220210123221} is an apocalyptic number.

It is an amenable number.

1220210123221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220210123221 is an equidigital number, since it uses as much as digits as its factorization.

1220210123221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 1220210123221 its reverse (1223210120221), we get a palindrome (2443420243442).

It can be divided in two parts, 1220210 and 123221, that added together give a palindrome (1343431).

The spelling of 1220210123221 in words is "one trillion, two hundred twenty billion, two hundred ten million, one hundred twenty-three thousand, two hundred twenty-one".