1220202221 has 8 divisors (see below), whose sum is σ = 1394839680. Its totient is φ = 1045645488.

The previous prime is 1220202209. The next prime is 1220202259. The reversal of 1220202221 is 1222020221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220202221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1220202196 and 1220202205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220202281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16715 + ... + 52151.

It is an arithmetic number, because the mean of its divisors is an integer number (174354960).

Almost surely, 2^1220202221 is an apocalyptic number.

It is an amenable number.

1220202221 is a deficient number, since it is larger than the sum of its proper divisors (174637459).

1220202221 is an equidigital number, since it uses as much as digits as its factorization.

1220202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40363.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1220202221 is about 34931.3930583938. The cubic root of 1220202221 is about 1068.5887649065.

Adding to 1220202221 its reverse (1222020221), we get a palindrome (2442222442).

The spelling of 1220202221 in words is "one billion, two hundred twenty million, two hundred two thousand, two hundred twenty-one".