1201220101001 has 4 divisors (see below), whose sum is σ = 1264442211600. Its totient is φ = 1137997990404.

The previous prime is 1201220100989. The next prime is 1201220101007. The reversal of 1201220101001 is 1001010221021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201220101001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201220101007) 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 3 ways as a sum of consecutive naturals, for example, 31611055271 + ... + 31611055308.

It is an arithmetic number, because the mean of its divisors is an integer number (316110552900).

Almost surely, 2^{1201220101001} is an apocalyptic number.

It is an amenable number.

1201220101001 is a deficient number, since it is larger than the sum of its proper divisors (63222110599).

1201220101001 is an equidigital number, since it uses as much as digits as its factorization.

1201220101001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63222110598.

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

Adding to 1201220101001 its reverse (1001010221021), we get a palindrome (2202230322022).

The spelling of 1201220101001 in words is "one trillion, two hundred one billion, two hundred twenty million, one hundred one thousand, one".