1201002011001 has 48 divisors (see below), whose sum is σ = 1960761706176. Its totient is φ = 730173445056.

The previous prime is 1201002010973. The next prime is 1201002011017. The reversal of 1201002011001 is 1001102001021.

It is a happy number.

It is not a de Polignac number, because 1201002011001 - 2¹⁷ = 1201001879929 is a prime.

It is a super-2 number, since 2×1201002011001² (a number of 25 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (1201002011071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2028070 + ... + 2552463.

It is an arithmetic number, because the mean of its divisors is an integer number (40849202212).

Almost surely, 2^{1201002011001} is an apocalyptic number.

It is an amenable number.

1201002011001 is a deficient number, since it is larger than the sum of its proper divisors (759759695175).

1201002011001 is an equidigital number, since it uses as much as digits as its factorization.

1201002011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4580644 (or 4580632 counting only the distinct ones).

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

Adding to 1201002011001 its reverse (1001102001021), we get a palindrome (2202104012022).

The spelling of 1201002011001 in words is "one trillion, two hundred one billion, two million, eleven thousand, one".