1222010221 has 4 divisors (see below), whose sum is σ = 1222457500. Its totient is φ = 1221562944.

The previous prime is 1222010219. The next prime is 1222010261. The reversal of 1222010221 is 1220102221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 737394025 + 484616196 = 27155^2 + 22014^2 .

It is a cyclic number.

It is not a de Polignac number, because 1222010221 - 2¹ = 1222010219 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 (1222010261) 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, 219516 + ... + 225013.

It is an arithmetic number, because the mean of its divisors is an integer number (305614375).

Almost surely, 2^1222010221 is an apocalyptic number.

It is an amenable number.

1222010221 is a deficient number, since it is larger than the sum of its proper divisors (447279).

1222010221 is an equidigital number, since it uses as much as digits as its factorization.

1222010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447278.

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

The square root of 1222010221 is about 34957.2627789992. The cubic root of 1222010221 is about 1069.1162881333.

Adding to 1222010221 its reverse (1220102221), we get a palindrome (2442112442).

It can be divided in two parts, 1 and 222010221, that added together give a palindrome (222010222).

The spelling of 1222010221 in words is "one billion, two hundred twenty-two million, ten thousand, two hundred twenty-one".