1220121210101 has 2 divisors, whose sum is σ = 1220121210102. Its totient is φ = 1220121210100.

The previous prime is 1220121210053. The next prime is 1220121210137. The reversal of 1220121210101 is 1010121210221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1218211083076 + 1910127025 = 1103726^2 + 43705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220121210101 - 2³⁰ = 1219047468277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1220121216101) 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, 610060605050 + 610060605051.

It is an arithmetic number, because the mean of its divisors is an integer number (610060605051).

Almost surely, 2^{1220121210101} is an apocalyptic number.

It is an amenable number.

1220121210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220121210101 is an equidigital number, since it uses as much as digits as its factorization.

1220121210101 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 1220121210101 its reverse (1010121210221), we get a palindrome (2230242420322).

The spelling of 1220121210101 in words is "one trillion, two hundred twenty billion, one hundred twenty-one million, two hundred ten thousand, one hundred one".