210021000120011 has 4 divisors (see below), whose sum is σ = 210296980410024. Its totient is φ = 209745019830000.

The previous prime is 210021000119951. The next prime is 210021000120017. The reversal of 210021000120011 is 110021000120012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210021000120011 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021000119974 and 210021000120001.

It is not an unprimeable number, because it can be changed into a prime (210021000120017) 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, 137990143865 + ... + 137990145386.

It is an arithmetic number, because the mean of its divisors is an integer number (52574245102506).

Almost surely, 2^{210021000120011} is an apocalyptic number.

210021000120011 is a deficient number, since it is larger than the sum of its proper divisors (275980290013).

210021000120011 is an equidigital number, since it uses as much as digits as its factorization.

210021000120011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275980290012.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210021000120011 its reverse (110021000120012), we get a palindrome (320042000240023).

Subtracting from 210021000120011 its reverse (110021000120012), we obtain a palindrome (99999999999999).

The spelling of 210021000120011 in words is "two hundred ten trillion, twenty-one billion, one hundred twenty thousand, eleven".