1220221207021 has 2 divisors, whose sum is σ = 1220221207022. Its totient is φ = 1220221207020.

The previous prime is 1220221207001. The next prime is 1220221207033. The reversal of 1220221207021 is 1207021220221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020645472900 + 199575734121 = 1010270^2 + 446739^2 .

It is an emirp because it is prime and its reverse (1207021220221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220221207021 - 2²³ = 1220212818413 is a prime.

It is a super-2 number, since 2×1220221207021² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220221206983 and 1220221207001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220221207001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610110603510 + 610110603511.

It is an arithmetic number, because the mean of its divisors is an integer number (610110603511).

Almost surely, 2^{1220221207021} is an apocalyptic number.

It is an amenable number.

1220221207021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220221207021 is an equidigital number, since it uses as much as digits as its factorization.

1220221207021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 1220221207021 its reverse (1207021220221), we get a palindrome (2427242427242).

The spelling of 1220221207021 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred seven thousand, twenty-one".