11001000120021 has 6 divisors (see below), whose sum is σ = 15890333506710. Its totient is φ = 7334000080008.

The previous prime is 11001000120001. The next prime is 11001000120037. The reversal of 11001000120021 is 12002100010011.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7354374491025 + 3646625628996 = 2711895^2 + 1909614^2 .

It is not a de Polignac number, because 11001000120021 - 2¹⁸ = 11000999857877 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: 1222333346669 = 11001000120021 / (1 + 1 + 0 + 0 + 1 + 0 + 0 + 0 + 1 + 2 + 0 + 0 + 2 + 1).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11001000119985 and 11001000120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11001000120001) 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, 611166673326 + ... + 611166673343.

It is an arithmetic number, because the mean of its divisors is an integer number (2648388917785).

Almost surely, 2^{11001000120021} is an apocalyptic number.

It is an amenable number.

11001000120021 is a deficient number, since it is larger than the sum of its proper divisors (4889333386689).

11001000120021 is a wasteful number, since it uses less digits than its factorization.

11001000120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222333346675 (or 1222333346672 counting only the distinct ones).

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

Adding to 11001000120021 its reverse (12002100010011), we get a palindrome (23003100130032).

The spelling of 11001000120021 in words is "eleven trillion, one billion, one hundred twenty thousand, twenty-one".