21011020220011 has 16 divisors (see below), whose sum is σ = 22407869484000. Its totient is φ = 19632060384768.

The previous prime is 21011020219967. The next prime is 21011020220041. The reversal of 21011020220011 is 11002202011012.

It is a cyclic number.

It is not a de Polignac number, because 21011020220011 - 2⁷ = 21011020219883 is a prime.

It is a super-2 number, since 2×21011020220011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21011020219973 and 21011020220000.

It is not an unprimeable number, because it can be changed into a prime (21011020220041) 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 15 ways as a sum of consecutive naturals, for example, 67305561 + ... + 67617013.

It is an arithmetic number, because the mean of its divisors is an integer number (1400491842750).

Almost surely, 2^{21011020220011} is an apocalyptic number.

21011020220011 is a deficient number, since it is larger than the sum of its proper divisors (1396849263989).

21011020220011 is a wasteful number, since it uses less digits than its factorization.

21011020220011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340158.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011020220011 its reverse (11002202011012), we get a palindrome (32013222231023).

The spelling of 21011020220011 in words is "twenty-one trillion, eleven billion, twenty million, two hundred twenty thousand, eleven".