10211202221 has 6 divisors (see below), whose sum is σ = 11223883566. Its totient is φ = 9282911000.

The previous prime is 10211202203. The next prime is 10211202227. The reversal of 10211202221 is 12220211201.

It can be written as a sum of positive squares in only one way, i.e., 6177174025 + 4034028196 = 78595^2 + 63514^2 .

It is not a de Polignac number, because 10211202221 - 2¹⁴ = 10211185837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10211202196 and 10211202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211202227) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42194930 + ... + 42195171.

It is an arithmetic number, because the mean of its divisors is an integer number (1870647261).

Almost surely, 2^10211202221 is an apocalyptic number.

10211202221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10211202221 is a deficient number, since it is larger than the sum of its proper divisors (1012681345).

10211202221 is an equidigital number, since it uses as much as digits as its factorization.

10211202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84390123 (or 84390112 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 10211202221 its reverse (12220211201), we get a palindrome (22431413422).

The spelling of 10211202221 in words is "ten billion, two hundred eleven million, two hundred two thousand, two hundred twenty-one".