21021202011011 has 4 divisors (see below), whose sum is σ = 21533914255224. Its totient is φ = 20508489766800.

The previous prime is 21021202010993. The next prime is 21021202011023. The reversal of 21021202011011 is 11011020212012.

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 21021202011011 - 2¹⁰ = 21021202009987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021202011071) 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, 256356122045 + ... + 256356122126.

It is an arithmetic number, because the mean of its divisors is an integer number (5383478563806).

Almost surely, 2^{21021202011011} is an apocalyptic number.

21021202011011 is a deficient number, since it is larger than the sum of its proper divisors (512712244213).

21021202011011 is an equidigital number, since it uses as much as digits as its factorization.

21021202011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512712244212.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21021202011011 its reverse (11011020212012), we get a palindrome (32032222223023).

The spelling of 21021202011011 in words is "twenty-one trillion, twenty-one billion, two hundred two million, eleven thousand, eleven".