1200210011001 has 6 divisors (see below), whose sum is σ = 1733636682570. Its totient is φ = 800140007328.

The previous prime is 1200210010877. The next prime is 1200210011029. The reversal of 1200210011001 is 1001100120021.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1114451816976 + 85758194025 = 1055676^2 + 292845^2 .

It is not a de Polignac number, because 1200210011001 - 2¹⁴ = 1200209994617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 133356667889 = 1200210011001 / (1 + 2 + 0 + 0 + 2 + 1 + 0 + 0 + 1 + 1 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1200210011081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 66678333936 + ... + 66678333953.

It is an arithmetic number, because the mean of its divisors is an integer number (288939447095).

Almost surely, 2^{1200210011001} is an apocalyptic number.

It is an amenable number.

1200210011001 is a deficient number, since it is larger than the sum of its proper divisors (533426671569).

1200210011001 is a wasteful number, since it uses less digits than its factorization.

1200210011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133356667895 (or 133356667892 counting only the distinct ones).

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

Adding to 1200210011001 its reverse (1001100120021), we get a palindrome (2201310131022).

The spelling of 1200210011001 in words is "one trillion, two hundred billion, two hundred ten million, eleven thousand, one".