21020013026011 has 2 divisors, whose sum is σ = 21020013026012. Its totient is φ = 21020013026010.

The previous prime is 21020013026009. The next prime is 21020013026071. The reversal of 21020013026011 is 11062031002012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21020013026011 - 2¹ = 21020013026009 is a prime.

It is a super-2 number, since 2×21020013026011² (a number of 27 digits) contains 22 as substring.

Together with 21020013026009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21020013026011.

It is not a weakly prime, because it can be changed into another prime (21020013026071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10510006513005 + 10510006513006.

It is an arithmetic number, because the mean of its divisors is an integer number (10510006513006).

Almost surely, 2^{21020013026011} is an apocalyptic number.

21020013026011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21020013026011 is an equidigital number, since it uses as much as digits as its factorization.

21020013026011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21020013026011 its reverse (11062031002012), we get a palindrome (32082044028023).

The spelling of 21020013026011 in words is "twenty-one trillion, twenty billion, thirteen million, twenty-six thousand, eleven".