1220211010121 has 2 divisors, whose sum is σ = 1220211010122. Its totient is φ = 1220211010120.

The previous prime is 1220211010111. The next prime is 1220211010127. The reversal of 1220211010121 is 1210101120221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 967398142096 + 252812868025 = 983564^2 + 502805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220211010121 is a prime.

It is a super-2 number, since 2×1220211010121² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220211010096 and 1220211010105.

It is not a weakly prime, because it can be changed into another prime (1220211010127) 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, 610105505060 + 610105505061.

It is an arithmetic number, because the mean of its divisors is an integer number (610105505061).

Almost surely, 2^{1220211010121} is an apocalyptic number.

It is an amenable number.

1220211010121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220211010121 is an equidigital number, since it uses as much as digits as its factorization.

1220211010121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1220211010121 its reverse (1210101120221), we get a palindrome (2430312130342).

The spelling of 1220211010121 in words is "one trillion, two hundred twenty billion, two hundred eleven million, ten thousand, one hundred twenty-one".