1221221012 has 12 divisors (see below), whose sum is σ = 2331422016. Its totient is φ = 555100440.

The previous prime is 1221221003. The next prime is 1221221033. The reversal of 1221221012 is 2101221221.

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, 13877468 + ... + 13877555.

It is an arithmetic number, because the mean of its divisors is an integer number (194285168).

Almost surely, 2^1221221012 is an apocalyptic number.

It is an amenable number.

1221221012 is a deficient number, since it is larger than the sum of its proper divisors (1110201004).

1221221012 is a wasteful number, since it uses less digits than its factorization.

1221221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27755038 (or 27755036 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 1221221012 is about 34945.9727579588. The cubic root of 1221221012 is about 1068.8860833205.

Adding to 1221221012 its reverse (2101221221), we get a palindrome (3322442233).

The spelling of 1221221012 in words is "one billion, two hundred twenty-one million, two hundred twenty-one thousand, twelve".