1202222221 has 4 divisors (see below), whose sum is σ = 1221930844. Its totient is φ = 1182513600.

The previous prime is 1202222159. The next prime is 1202222227. The reversal of 1202222221 is 1222222021.

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 221592996 + 980629225 = 14886^2 + 31315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202222221 - 2¹³ = 1202214029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1202222195 and 1202222204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1202222227) 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, 9854220 + ... + 9854341.

It is an arithmetic number, because the mean of its divisors is an integer number (305482711).

Almost surely, 2^1202222221 is an apocalyptic number.

It is an amenable number.

1202222221 is a deficient number, since it is larger than the sum of its proper divisors (19708623).

1202222221 is an equidigital number, since it uses as much as digits as its factorization.

1202222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19708622.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 1202222221 is about 34673.0763128973. The cubic root of 1202222221 is about 1063.3141264032.

Adding to 1202222221 its reverse (1222222021), we get a palindrome (2424444242).

It can be divided in two parts, 12022 and 22221, that added together give a palindrome (34243).

The spelling of 1202222221 in words is "one billion, two hundred two million, two hundred twenty-two thousand, two hundred twenty-one".