1221012012 has 48 divisors (see below), whose sum is σ = 3290861952. Its totient is φ = 348238080.

The previous prime is 1221012007. The next prime is 1221012049. The reversal of 1221012012 is 2102101221.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 15 ways as a sum of consecutive naturals, for example, 269818 + ... + 274305.

It is an arithmetic number, because the mean of its divisors is an integer number (68559624).

Almost surely, 2^1221012012 is an apocalyptic number.

1221012012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221012012 is an abundant number, since it is smaller than the sum of its proper divisors (2069849940).

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

1221012012 is a wasteful number, since it uses less digits than its factorization.

1221012012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544158 (or 544156 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1221012012 is about 34942.9822997408. The cubic root of 1221012012 is about 1068.8251033847.

Adding to 1221012012 its reverse (2102101221), we get a palindrome (3323113233).

The spelling of 1221012012 in words is "one billion, two hundred twenty-one million, twelve thousand, twelve".