1011001211001 has 12 divisors (see below), whose sum is σ = 1460862886912. Its totient is φ = 673757205336.

The previous prime is 1011001210997. The next prime is 1011001211057. The reversal of 1011001211001 is 1001121001101.

It is not a de Polignac number, because 1011001211001 - 2² = 1011001210997 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 a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1011001210001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20273881 + ... + 20323686.

Almost surely, 2^{1011001211001} is an apocalyptic number.

It is an amenable number.

1011001211001 is a deficient number, since it is larger than the sum of its proper divisors (449861675911).

1011001211001 is a wasteful number, since it uses less digits than its factorization.

1011001211001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40600340 (or 40600337 counting only the distinct ones).

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

Adding to 1011001211001 its reverse (1001121001101), we get a palindrome (2012122212102).

The spelling of 1011001211001 in words is "one trillion, eleven billion, one million, two hundred eleven thousand, one".