1001001211101 has 24 divisors (see below), whose sum is σ = 1509157780416. Its totient is φ = 638149395840.

The previous prime is 1001001211081. The next prime is 1001001211103. The reversal of 1001001211101 is 1011121001001.

It is not a de Polignac number, because 1001001211101 - 2⁶ = 1001001211037 is a prime.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001001211103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 135646 + ... + 1421408.

It is an arithmetic number, because the mean of its divisors is an integer number (62881574184).

Almost surely, 2^{1001001211101} is an apocalyptic number.

It is an amenable number.

1001001211101 is a deficient number, since it is larger than the sum of its proper divisors (508156569315).

1001001211101 is a wasteful number, since it uses less digits than its factorization.

1001001211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289553 (or 1289550 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 1001001211101 its reverse (1011121001001), we get a palindrome (2012122212102).

The spelling of 1001001211101 in words is "one trillion, one billion, one million, two hundred eleven thousand, one hundred one".