1220051642 has 16 divisors (see below), whose sum is σ = 1900596192. Its totient is φ = 586943280.

The previous prime is 1220051641. The next prime is 1220051671. The reversal of 1220051642 is 2461500221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1220051641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100109 + ... + 111632.

It is an arithmetic number, because the mean of its divisors is an integer number (118787262).

Almost surely, 2^1220051642 is an apocalyptic number.

1220051642 is a deficient number, since it is larger than the sum of its proper divisors (680544550).

1220051642 is a wasteful number, since it uses less digits than its factorization.

1220051642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211853.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1220051642 is about 34929.2376384026. The cubic root of 1220051642 is about 1068.5448067155.

Adding to 1220051642 its reverse (2461500221), we get a palindrome (3681551863).

The spelling of 1220051642 in words is "one billion, two hundred twenty million, fifty-one thousand, six hundred forty-two".