21000010212211 has 4 divisors (see below), whose sum is σ = 21000139940800. Its totient is φ = 20999880483624.

The previous prime is 21000010212169. The next prime is 21000010212217. The reversal of 21000010212211 is 11221201000012.

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 21000010212211 - 2¹⁵ = 21000010179443 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000010212191 and 21000010212200.

It is not an unprimeable number, because it can be changed into a prime (21000010212217) 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, 64621176 + ... + 64945333.

It is an arithmetic number, because the mean of its divisors is an integer number (5250034985200).

Almost surely, 2^{21000010212211} is an apocalyptic number.

21000010212211 is a deficient number, since it is larger than the sum of its proper divisors (129728589).

21000010212211 is a wasteful number, since it uses less digits than its factorization.

21000010212211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129728588.

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

Adding to 21000010212211 its reverse (11221201000012), we get a palindrome (32221211212223).

The spelling of 21000010212211 in words is "twenty-one trillion, ten million, two hundred twelve thousand, two hundred eleven".