21000011000211 has 16 divisors (see below), whose sum is σ = 31114741543200. Its totient is φ = 13998380972544.

The previous prime is 21000011000203. The next prime is 21000011000219. The reversal of 21000011000211 is 11200011000012.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21000011000203) and next prime (21000011000219).

It is not a de Polignac number, because 21000011000211 - 2³ = 21000011000203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 21000011000193 and 21000011000202.

It is not an unprimeable number, because it can be changed into a prime (21000011000219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44939946 + ... + 45404831.

It is an arithmetic number, because the mean of its divisors is an integer number (1944671346450).

Almost surely, 2^{21000011000211} is an apocalyptic number.

21000011000211 is a deficient number, since it is larger than the sum of its proper divisors (10114730542989).

21000011000211 is an equidigital number, since it uses as much as digits as its factorization.

21000011000211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90353395 (or 90353389 counting only the distinct ones).

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

Adding to 21000011000211 its reverse (11200011000012), we get a palindrome (32200022000223).

The spelling of 21000011000211 in words is "twenty-one trillion, eleven million, two hundred eleven", and thus it is an aban number.