21013033011 has 16 divisors (see below), whose sum is σ = 28684571808. Its totient is φ = 13678444800.

The previous prime is 21013032979. The next prime is 21013033021. The reversal of 21013033011 is 11033031012.

It is not a de Polignac number, because 21013033011 - 2⁵ = 21013032979 is a prime.

It is a super-2 number, since 2×21013033011² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21013033021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 394000 + ... + 444141.

It is an arithmetic number, because the mean of its divisors is an integer number (1792785738).

Almost surely, 2^21013033011 is an apocalyptic number.

21013033011 is a deficient number, since it is larger than the sum of its proper divisors (7671538797).

21013033011 is a wasteful number, since it uses less digits than its factorization.

21013033011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 838342.

The product of its (nonzero) digits is 54, while the sum is 15.

Adding to 21013033011 its reverse (11033031012), we get a palindrome (32046064023).

The spelling of 21013033011 in words is "twenty-one billion, thirteen million, thirty-three thousand, eleven".