1220101021001 has 2 divisors, whose sum is σ = 1220101021002. Its totient is φ = 1220101021000.

The previous prime is 1220101020997. The next prime is 1220101021019. The reversal of 1220101021001 is 1001201010221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 948576654601 + 271524366400 = 973949^2 + 521080^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220101021001 - 2² = 1220101020997 is a prime.

It is not a weakly prime, because it can be changed into another prime (1220101020001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610050510500 + 610050510501.

It is an arithmetic number, because the mean of its divisors is an integer number (610050510501).

Almost surely, 2^{1220101021001} is an apocalyptic number.

It is an amenable number.

1220101021001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220101021001 is an equidigital number, since it uses as much as digits as its factorization.

1220101021001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1220101021001 its reverse (1001201010221), we get a palindrome (2221302031222).

The spelling of 1220101021001 in words is "one trillion, two hundred twenty billion, one hundred one million, twenty-one thousand, one".