1201221012101 has 6 divisors (see below), whose sum is σ = 1320350368806. Its totient is φ = 1092019101800.

The previous prime is 1201221012097. The next prime is 1201221012109. The reversal of 1201221012101 is 1012101221021.

It can be written as a sum of positive squares in only one way, i.e., 1195403289025 + 5817723076 = 1093345^2 + 76274^2 .

It is not a de Polignac number, because 1201221012101 - 2² = 1201221012097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201221012109) 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 in 5 ways as a sum of consecutive naturals, for example, 4963723070 + ... + 4963723311.

It is an arithmetic number, because the mean of its divisors is an integer number (220058394801).

Almost surely, 2^{1201221012101} is an apocalyptic number.

1201221012101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1201221012101 is a deficient number, since it is larger than the sum of its proper divisors (119129356705).

1201221012101 is an equidigital number, since it uses as much as digits as its factorization.

1201221012101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9927446403 (or 9927446392 counting only the distinct ones).

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

Adding to 1201221012101 its reverse (1012101221021), we get a palindrome (2213322233122).

The spelling of 1201221012101 in words is "one trillion, two hundred one billion, two hundred twenty-one million, twelve thousand, one hundred one".