21034020011011 has 4 divisors (see below), whose sum is σ = 24038880012592. Its totient is φ = 18029160009432.

The previous prime is 21034020010981. The next prime is 21034020011033. The reversal of 21034020011011 is 11011002043012.

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 21034020011011 - 2¹⁹ = 21034019486723 is a prime.

It is a super-2 number, since 2×21034020011011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034020011911) 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, 1502430000780 + ... + 1502430000793.

It is an arithmetic number, because the mean of its divisors is an integer number (6009720003148).

Almost surely, 2^{21034020011011} is an apocalyptic number.

21034020011011 is a deficient number, since it is larger than the sum of its proper divisors (3004860001581).

21034020011011 is an equidigital number, since it uses as much as digits as its factorization.

21034020011011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3004860001580.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21034020011011 its reverse (11011002043012), we get a palindrome (32045022054023).

The spelling of 21034020011011 in words is "twenty-one trillion, thirty-four billion, twenty million, eleven thousand, eleven".