1221255411 has 8 divisors (see below), whose sum is σ = 1672349904. Its totient is φ = 792165600.

The previous prime is 1221255383. The next prime is 1221255437. The reversal of 1221255411 is 1145521221.

It is a happy number.

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

It is not a de Polignac number, because 1221255411 - 2⁹ = 1221254899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221255481) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5501040 + ... + 5501261.

It is an arithmetic number, because the mean of its divisors is an integer number (209043738).

Almost surely, 2^1221255411 is an apocalyptic number.

1221255411 is a deficient number, since it is larger than the sum of its proper divisors (451094493).

1221255411 is a wasteful number, since it uses less digits than its factorization.

1221255411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11002341.

The product of its digits is 800, while the sum is 24.

The square root of 1221255411 is about 34946.4649285160. The cubic root of 1221255411 is about 1068.8961192509.

Adding to 1221255411 its reverse (1145521221), we get a palindrome (2366776632).

The spelling of 1221255411 in words is "one billion, two hundred twenty-one million, two hundred fifty-five thousand, four hundred eleven".