10212221221 has 12 divisors (see below), whose sum is σ = 10563359232. Its totient is φ = 9872415000.

The previous prime is 10212221209. The next prime is 10212221233. The reversal of 10212221221 is 12212221201.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (10212221209) and next prime (10212221233).

It is not a de Polignac number, because 10212221221 - 2¹³ = 10212213029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10212221195 and 10212221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212221291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1004956 + ... + 1015066.

It is an arithmetic number, because the mean of its divisors is an integer number (880279936).

Almost surely, 2^10212221221 is an apocalyptic number.

It is an amenable number.

10212221221 is a deficient number, since it is larger than the sum of its proper divisors (351138011).

10212221221 is a wasteful number, since it uses less digits than its factorization.

10212221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11224 (or 11193 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 10212221221 its reverse (12212221201), we get a palindrome (22424442422).

The spelling of 10212221221 in words is "ten billion, two hundred twelve million, two hundred twenty-one thousand, two hundred twenty-one".