1213221012 has 96 divisors (see below), whose sum is σ = 2956800000. Its totient is φ = 386964864.

The previous prime is 1213221007. The next prime is 1213221013. The reversal of 1213221012 is 2101223121.

It is a junction number, because it is equal to n+sod(n) for n = 1213220982 and 1213221000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6096489 + ... + 6096687.

It is an arithmetic number, because the mean of its divisors is an integer number (30800000).

Almost surely, 2^1213221012 is an apocalyptic number.

1213221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1213221012 is an abundant number, since it is smaller than the sum of its proper divisors (1743578988).

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

1213221012 is a wasteful number, since it uses less digits than its factorization.

1213221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 451 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1213221012 is about 34831.3222832553. The cubic root of 1213221012 is about 1066.5469410327.

Adding to 1213221012 its reverse (2101223121), we get a palindrome (3314444133).

The spelling of 1213221012 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, twelve".