1221122008 has 16 divisors (see below), whose sum is σ = 2315331000. Its totient is φ = 603700416.

The previous prime is 1221121991. The next prime is 1221122009. The reversal of 1221122008 is 8002211221.

It is a super-2 number, since 2×1221122008² = 2982277916843904128, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221122009) 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, 856818 + ... + 858241.

Almost surely, 2^1221122008 is an apocalyptic number.

It is an amenable number.

1221122008 is a deficient number, since it is larger than the sum of its proper divisors (1094208992).

1221122008 is a wasteful number, since it uses less digits than its factorization.

1221122008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1715154 (or 1715150 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 1221122008 is about 34944.5561997860. The cubic root of 1221122008 is about 1068.8571977880.

Adding to 1221122008 its reverse (8002211221), we get a palindrome (9223333229).

The spelling of 1221122008 in words is "one billion, two hundred twenty-one million, one hundred twenty-two thousand, eight".