10212221 has 4 divisors (see below), whose sum is σ = 10219872. Its totient is φ = 10204572.

The previous prime is 10212203. The next prime is 10212233. The reversal of 10212221 is 12221201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12221201 = 59 ⋅207139.

It is a cyclic number.

It is not a de Polignac number, because 10212221 - 2¹⁰ = 10211197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10212421) 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, 1241 + ... + 4686.

It is an arithmetic number, because the mean of its divisors is an integer number (2554968).

Almost surely, 2^10212221 is an apocalyptic number.

It is an amenable number.

10212221 is a deficient number, since it is larger than the sum of its proper divisors (7651).

10212221 is an equidigital number, since it uses as much as digits as its factorization.

10212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7650.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 10212221 is about 3195.6565835521. The cubic root of 10212221 is about 216.9568674138.

Adding to 10212221 its reverse (12221201), we get a palindrome (22433422).

The spelling of 10212221 in words is "ten million, two hundred twelve thousand, two hundred twenty-one".