1221350412 has 12 divisors (see below), whose sum is σ = 2849817656. Its totient is φ = 407116800.

The previous prime is 1221350387. The next prime is 1221350441. The reversal of 1221350412 is 2140531221.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50889589 + ... + 50889612.

Almost surely, 2^1221350412 is an apocalyptic number.

1221350412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221350412 is an abundant number, since it is smaller than the sum of its proper divisors (1628467244).

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

1221350412 is a wasteful number, since it uses less digits than its factorization.

1221350412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101779208 (or 101779206 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 1221350412 is about 34947.8241382779. The cubic root of 1221350412 is about 1068.9238348748.

Adding to 1221350412 its reverse (2140531221), we get a palindrome (3361881633).

The spelling of 1221350412 in words is "one billion, two hundred twenty-one million, three hundred fifty thousand, four hundred twelve".