1213056216 has 128 divisors (see below), whose sum is σ = 3755808000. Its totient is φ = 360516096.

The previous prime is 1213056193. The next prime is 1213056223. The reversal of 1213056216 is 6126503121.

1213056216 is a `hidden beast` number, since 1 + 2 + 1 + 30 + 5 + 621 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1213056216.

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 31 ways as a sum of consecutive naturals, for example, 61075 + ... + 78461.

It is an arithmetic number, because the mean of its divisors is an integer number (29342250).

Almost surely, 2^1213056216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1213056216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1877904000).

1213056216 is an abundant number, since it is smaller than the sum of its proper divisors (2542751784).

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

1213056216 is a wasteful number, since it uses less digits than its factorization.

1213056216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17438 (or 17428 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 1213056216 is about 34828.9565735180. The cubic root of 1213056216 is about 1066.4986479278.

Adding to 1213056216 its reverse (6126503121), we get a palindrome (7339559337).

The spelling of 1213056216 in words is "one billion, two hundred thirteen million, fifty-six thousand, two hundred sixteen".