21121002211 has 2 divisors, whose sum is σ = 21121002212. Its totient is φ = 21121002210.

The previous prime is 21121002187. The next prime is 21121002233. The reversal of 21121002211 is 11220012112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21121002211 - 2⁵ = 21121002179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21121002191 and 21121002200.

It is not a weakly prime, because it can be changed into another prime (21121002611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560501105 + 10560501106.

It is an arithmetic number, because the mean of its divisors is an integer number (10560501106).

Almost surely, 2^21121002211 is an apocalyptic number.

21121002211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121002211 is an equidigital number, since it uses as much as digits as its factorization.

21121002211 is an evil number, because the sum of its binary digits is even.

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

Adding to 21121002211 its reverse (11220012112), we get a palindrome (32341014323).

Subtracting from 21121002211 its reverse (11220012112), we obtain a palindrome (9900990099).

The spelling of 21121002211 in words is "twenty-one billion, one hundred twenty-one million, two thousand, two hundred eleven".