21000002211211 has 4 divisors (see below), whose sum is σ = 21001399339024. Its totient is φ = 20998605083400.

The previous prime is 21000002211197. The next prime is 21000002211217. The reversal of 21000002211211 is 11211220000012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21000002211211 - 2⁵ = 21000002211179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000002211191 and 21000002211200.

It is not an unprimeable number, because it can be changed into a prime (21000002211217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 698541360 + ... + 698571421.

It is an arithmetic number, because the mean of its divisors is an integer number (5250349834756).

Almost surely, 2^{21000002211211} is an apocalyptic number.

21000002211211 is a deficient number, since it is larger than the sum of its proper divisors (1397127813).

21000002211211 is a wasteful number, since it uses less digits than its factorization.

21000002211211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397127812.

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

Adding to 21000002211211 its reverse (11211220000012), we get a palindrome (32211222211223).

The spelling of 21000002211211 in words is "twenty-one trillion, two million, two hundred eleven thousand, two hundred eleven".