1221013012 has 12 divisors (see below), whose sum is σ = 2138508820. Its totient is φ = 610010496.

The previous prime is 1221013007. The next prime is 1221013051. The reversal of 1221013012 is 2103101221.

It can be written as a sum of positive squares in 2 ways, for example, as 797723536 + 423289476 = 28244^2 + 20574^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1221012983 and 1221013001.

It is a congruent 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, 118437 + ... + 128332.

Almost surely, 2^1221013012 is an apocalyptic number.

It is an amenable number.

1221013012 is a deficient number, since it is larger than the sum of its proper divisors (917495808).

1221013012 is a wasteful number, since it uses less digits than its factorization.

1221013012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248010 (or 248008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1221013012 is about 34942.9966087627. The cubic root of 1221013012 is about 1068.8253951713.

Adding to 1221013012 its reverse (2103101221), we get a palindrome (3324114233).

The spelling of 1221013012 in words is "one billion, two hundred twenty-one million, thirteen thousand, twelve".