21002022211 has 2 divisors, whose sum is σ = 21002022212. Its totient is φ = 21002022210.

The previous prime is 21002022179. The next prime is 21002022253. The reversal of 21002022211 is 11222020012.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21002022211 - 2⁵ = 21002022179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21002022191 and 21002022200.

It is not a weakly prime, because it can be changed into another prime (21002022271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10501011105 + 10501011106.

It is an arithmetic number, because the mean of its divisors is an integer number (10501011106).

Almost surely, 2^21002022211 is an apocalyptic number.

21002022211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21002022211 is an equidigital number, since it uses as much as digits as its factorization.

21002022211 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21002022211 its reverse (11222020012), we get a palindrome (32224042223).

The spelling of 21002022211 in words is "twenty-one billion, two million, twenty-two thousand, two hundred eleven".