10221021211 has 4 divisors (see below), whose sum is σ = 10221318352. Its totient is φ = 10220724072.

The previous prime is 10221021169. The next prime is 10221021227. The reversal of 10221021211 is 11212012201.

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 10221021211 - 2⁹ = 10221020699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10221021191 and 10221021200.

It is not an unprimeable number, because it can be changed into a prime (10221021011) 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, 89016 + ... + 168421.

It is an arithmetic number, because the mean of its divisors is an integer number (2555329588).

Almost surely, 2^10221021211 is an apocalyptic number.

10221021211 is a deficient number, since it is larger than the sum of its proper divisors (297141).

10221021211 is an equidigital number, since it uses as much as digits as its factorization.

10221021211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297140.

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

Adding to 10221021211 its reverse (11212012201), we get a palindrome (21433033412).

The spelling of 10221021211 in words is "ten billion, two hundred twenty-one million, twenty-one thousand, two hundred eleven".