1201011002001 has 36 divisors (see below), whose sum is σ = 1802122811632. Its totient is φ = 800363845368.

The previous prime is 1201011001963. The next prime is 1201011002003. The reversal of 1201011002001 is 1002001101021.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1201011002001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1201011002003) 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 35 ways as a sum of consecutive naturals, for example, 17569050 + ... + 17637276.

Almost surely, 2^{1201011002001} is an apocalyptic number.

It is an amenable number.

1201011002001 is a deficient number, since it is larger than the sum of its proper divisors (601111809631).

1201011002001 is an frugal number, since it uses more digits than its factorization.

1201011002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70934 (or 70913 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1201011002001 its reverse (1002001101021), we get a palindrome (2203012103022).

The spelling of 1201011002001 in words is "one trillion, two hundred one billion, eleven million, two thousand, one".