1221331434 has 8 divisors (see below), whose sum is σ = 2442662880. Its totient is φ = 407110476.

The previous prime is 1221331429. The next prime is 1221331469. The reversal of 1221331434 is 4341331221.

It is a happy number.

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

1221331434 is an admirable number.

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, 101777614 + ... + 101777625.

It is an arithmetic number, because the mean of its divisors is an integer number (305332860).

Almost surely, 2^1221331434 is an apocalyptic number.

1221331434 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221331434 is a wasteful number, since it uses less digits than its factorization.

1221331434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203555244.

The product of its digits is 1728, while the sum is 24.

The square root of 1221331434 is about 34947.5526181734. The cubic root of 1221331434 is about 1068.9182983416.

Adding to 1221331434 its reverse (4341331221), we get a palindrome (5562662655).

The spelling of 1221331434 in words is "one billion, two hundred twenty-one million, three hundred thirty-one thousand, four hundred thirty-four".