21021120212011 has 4 divisors (see below), whose sum is σ = 21021349125112. Its totient is φ = 21020891298912.

The previous prime is 21021120211967. The next prime is 21021120212021. The reversal of 21021120212011 is 11021202112012.

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

It is a cyclic number.

It is not a de Polignac number, because 21021120212011 - 2²⁵ = 21021086657579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021120212021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114318750 + ... + 114502483.

It is an arithmetic number, because the mean of its divisors is an integer number (5255337281278).

Almost surely, 2^{21021120212011} is an apocalyptic number.

21021120212011 is a deficient number, since it is larger than the sum of its proper divisors (228913101).

21021120212011 is an equidigital number, since it uses as much as digits as its factorization.

21021120212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228913100.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21021120212011 its reverse (11021202112012), we get a palindrome (32042322324023).

The spelling of 21021120212011 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred twelve thousand, eleven".