21021101011011 has 8 divisors (see below), whose sum is σ = 28216242968400. Its totient is φ = 13920013197152.

The previous prime is 21021101010989. The next prime is 21021101011019. The reversal of 21021101011011 is 11011010112012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21021101011011 - 2²⁵ = 21021067456579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021101011019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23513535360 + ... + 23513536253.

It is an arithmetic number, because the mean of its divisors is an integer number (3527030371050).

Almost surely, 2^{21021101011011} is an apocalyptic number.

21021101011011 is a deficient number, since it is larger than the sum of its proper divisors (7195141957389).

21021101011011 is a wasteful number, since it uses less digits than its factorization.

21021101011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47027071765.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21021101011011 its reverse (11011010112012), we get a palindrome (32032111123023).

The spelling of 21021101011011 in words is "twenty-one trillion, twenty-one billion, one hundred one million, eleven thousand, eleven".