1220204242 has 4 divisors (see below), whose sum is σ = 1830306366. Its totient is φ = 610102120.

The previous prime is 1220204233. The next prime is 1220204243. The reversal of 1220204242 is 2424020221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2424020221 = 7 ⋅346288603.

It can be written as a sum of positive squares in only one way, i.e., 975250441 + 244953801 = 31229^2 + 15651^2 .

It is not an unprimeable number, because it can be changed into a prime (1220204243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305051059 + ... + 305051062.

Almost surely, 2^1220204242 is an apocalyptic number.

1220204242 is a deficient number, since it is larger than the sum of its proper divisors (610102124).

1220204242 is an equidigital number, since it uses as much as digits as its factorization.

1220204242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610102123.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 1220204242 is about 34931.4219865152. The cubic root of 1220204242 is about 1068.5893548679.

Adding to 1220204242 its reverse (2424020221), we get a palindrome (3644224463).

The spelling of 1220204242 in words is "one billion, two hundred twenty million, two hundred four thousand, two hundred forty-two".