11011001001021 has 48 divisors (see below), whose sum is σ = 18572985360384. Its totient is φ = 6155025721632.

The previous prime is 11011001000899. The next prime is 11011001001043. The reversal of 11011001001021 is 12010010011011.

It is not a de Polignac number, because 11011001001021 - 2³³ = 11002411066429 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 11011001000994 and 11011001001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11011001002021) 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, 4947756 + ... + 6819258.

It is an arithmetic number, because the mean of its divisors is an integer number (386937195008).

Almost surely, 2^{11011001001021} is an apocalyptic number.

It is an amenable number.

11011001001021 is a deficient number, since it is larger than the sum of its proper divisors (7561984359363).

11011001001021 is a wasteful number, since it uses less digits than its factorization.

11011001001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1873550 (or 1873547 counting only the distinct ones).

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

Adding to 11011001001021 its reverse (12010010011011), we get a palindrome (23021011012032).

The spelling of 11011001001021 in words is "eleven trillion, eleven billion, one million, one thousand, twenty-one".