21010010020011 has 6 divisors (see below), whose sum is σ = 30347792251140. Its totient is φ = 14006673346668.

The previous prime is 21010010019959. The next prime is 21010010020057. The reversal of 21010010020011 is 11002001001012.

It is a happy number.

It is not a de Polignac number, because 21010010020011 - 2¹³ = 21010010011819 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2334445557779 = 21010010020011 / (2 + 1 + 0 + 1 + 0 + 0 + 1 + 0 + 0 + 2 + 0 + 0 + 1 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 21010010019975 and 21010010020002.

It is not an unprimeable number, because it can be changed into a prime (21010010220011) 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 5 ways as a sum of consecutive naturals, for example, 1167222778881 + ... + 1167222778898.

It is an arithmetic number, because the mean of its divisors is an integer number (5057965375190).

Almost surely, 2^{21010010020011} is an apocalyptic number.

21010010020011 is a deficient number, since it is larger than the sum of its proper divisors (9337782231129).

21010010020011 is a wasteful number, since it uses less digits than its factorization.

21010010020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334445557785 (or 2334445557782 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 21010010020011 its reverse (11002001001012), we get a palindrome (32012011021023).

The spelling of 21010010020011 in words is "twenty-one trillion, ten billion, ten million, twenty thousand, eleven".