1021100120011 has 4 divisors (see below), whose sum is σ = 1022765863072. Its totient is φ = 1019434376952.

The previous prime is 1021100119999. The next prime is 1021100120023. The reversal of 1021100120011 is 1100210011201.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1021100119999) and next prime (1021100120023).

It is a cyclic number.

It is not a de Polignac number, because 1021100120011 - 2⁵ = 1021100119979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1021100120011.

It is not an unprimeable number, because it can be changed into a prime (1021100120071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832870611 + ... + 832871836.

It is an arithmetic number, because the mean of its divisors is an integer number (255691465768).

Almost surely, 2^{1021100120011} is an apocalyptic number.

1021100120011 is a deficient number, since it is larger than the sum of its proper divisors (1665743061).

1021100120011 is an equidigital number, since it uses as much as digits as its factorization.

1021100120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665743060.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1021100120011 its reverse (1100210011201), we get a palindrome (2121310131212).

The spelling of 1021100120011 in words is "one trillion, twenty-one billion, one hundred million, one hundred twenty thousand, eleven".