21335054121011 has 4 divisors (see below), whose sum is σ = 21358269632400. Its totient is φ = 21311838609624.

The previous prime is 21335054121001. The next prime is 21335054121053. The reversal of 21335054121011 is 11012145053312.

It is a happy number.

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 21335054121011 - 2²⁶ = 21334987012147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21335054121001) 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, 11607754316 + ... + 11607756153.

It is an arithmetic number, because the mean of its divisors is an integer number (5339567408100).

Almost surely, 2^{21335054121011} is an apocalyptic number.

21335054121011 is a deficient number, since it is larger than the sum of its proper divisors (23215511389).

21335054121011 is an equidigital number, since it uses as much as digits as its factorization.

21335054121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23215511388.

The product of its (nonzero) digits is 3600, while the sum is 29.

Adding to 21335054121011 its reverse (11012145053312), we get a palindrome (32347199174323).

The spelling of 21335054121011 in words is "twenty-one trillion, three hundred thirty-five billion, fifty-four million, one hundred twenty-one thousand, eleven".