1213221276 has 18 divisors (see below), whose sum is σ = 3066753872. Its totient is φ = 404407080.

The previous prime is 1213221203. The next prime is 1213221277. The reversal of 1213221276 is 6721223121.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×1213221276³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213221277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16850260 + ... + 16850331.

Almost surely, 2^1213221276 is an apocalyptic number.

It is an amenable number.

1213221276 is an abundant number, since it is smaller than the sum of its proper divisors (1853532596).

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

1213221276 is a wasteful number, since it uses less digits than its factorization.

1213221276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33700601 (or 33700596 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 1213221276 is about 34831.3260729476. The cubic root of 1213221276 is about 1066.5470183938.

Adding to 1213221276 its reverse (6721223121), we get a palindrome (7934444397).

The spelling of 1213221276 in words is "one billion, two hundred thirteen million, two hundred twenty-one thousand, two hundred seventy-six".