1221303012 has 12 divisors (see below), whose sum is σ = 2849707056. Its totient is φ = 407101000.

The previous prime is 1221302981. The next prime is 1221303049. The reversal of 1221303012 is 2103031221.

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

It is a junction number, because it is equal to n+sod(n) for n = 1221302982 and 1221303000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50887614 + ... + 50887637.

It is an arithmetic number, because the mean of its divisors is an integer number (237475588).

Almost surely, 2^1221303012 is an apocalyptic number.

1221303012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221303012 is an abundant number, since it is smaller than the sum of its proper divisors (1628404044).

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

1221303012 is a wasteful number, since it uses less digits than its factorization.

1221303012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101775258 (or 101775256 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1221303012 is about 34947.1459778907. The cubic root of 1221303012 is about 1068.9100065624.

Adding to 1221303012 its reverse (2103031221), we get a palindrome (3324334233).

The spelling of 1221303012 in words is "one billion, two hundred twenty-one million, three hundred three thousand, twelve".