1221221122 has 8 divisors (see below), whose sum is σ = 1998361872. Its totient is φ = 555100500.

The previous prime is 1221221119. The next prime is 1221221153. The reversal of 1221221122 is 2211221221.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 1221221096 and 1221221105.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27755004 + ... + 27755047.

It is an arithmetic number, because the mean of its divisors is an integer number (249795234).

Almost surely, 2^1221221122 is an apocalyptic number.

1221221122 is a deficient number, since it is larger than the sum of its proper divisors (777140750).

1221221122 is a wasteful number, since it uses less digits than its factorization.

1221221122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55510064.

The product of its digits is 64, while the sum is 16.

The square root of 1221221122 is about 34945.9743318168. The cubic root of 1221221122 is about 1068.8861154134.

Adding to 1221221122 its reverse (2211221221), we get a palindrome (3432442343).

Subtracting 1221221122 from its reverse (2211221221), we obtain a palindrome (990000099).

It can be divided in two parts, 1221 and 221122, that multiplied together give a palindrome (269989962).

The spelling of 1221221122 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, one hundred twenty-two".