1221121226 has 8 divisors (see below), whose sum is σ = 1972580484. Its totient is φ = 563594400.

The previous prime is 1221121199. The next prime is 1221121259. The reversal of 1221121226 is 6221211221.

It can be written as a sum of positive squares in 2 ways, for example, as 1178205625 + 42915601 = 34325^2 + 6551^2 .

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

It is a super-2 number, since 2×1221121226² = 2982274097175486152, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1221121198 and 1221121207.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 23483075 + ... + 23483126.

Almost surely, 2^1221121226 is an apocalyptic number.

1221121226 is a deficient number, since it is larger than the sum of its proper divisors (751459258).

1221121226 is a wasteful number, since it uses less digits than its factorization.

1221121226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46966216.

The product of its digits is 192, while the sum is 20.

The square root of 1221121226 is about 34944.5450106308. The cubic root of 1221121226 is about 1068.8569696245.

Adding to 1221121226 its reverse (6221211221), we get a palindrome (7442332447).

The spelling of 1221121226 in words is "one billion, two hundred twenty-one million, one hundred twenty-one thousand, two hundred twenty-six".