21011020000211 has 4 divisors (see below), whose sum is σ = 21011029854672. Its totient is φ = 21011010145752.

The previous prime is 21011020000181. The next prime is 21011020000237. The reversal of 21011020000211 is 11200002011012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21011020000211 - 2³⁰ = 21009946258387 is a prime.

It is a super-2 number, since 2×21011020000211² (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 = 21011020000192 and 21011020000201.

It is not an unprimeable number, because it can be changed into a prime (21011020006211) 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 3 ways as a sum of consecutive naturals, for example, 247436 + ... + 6487161.

It is an arithmetic number, because the mean of its divisors is an integer number (5252757463668).

Almost surely, 2^{21011020000211} is an apocalyptic number.

21011020000211 is a deficient number, since it is larger than the sum of its proper divisors (9854461).

21011020000211 is an equidigital number, since it uses as much as digits as its factorization.

21011020000211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854460.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21011020000211 its reverse (11200002011012), we get a palindrome (32211022011223).

The spelling of 21011020000211 in words is "twenty-one trillion, eleven billion, twenty million, two hundred eleven", and thus it is an aban number.