1216216424318 has 16 divisors (see below), whose sum is σ = 2091129222624. Its totient is φ = 519688915200.

The previous prime is 1216216424317. The next prime is 1216216424363. The reversal of 1216216424318 is 8134246126121.

It is a happy number.

It is a super-2 number, since 2×1216216424318² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216216424317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128886383 + ... + 128895818.

It is an arithmetic number, because the mean of its divisors is an integer number (130695576414).

Almost surely, 2^{1216216424318} is an apocalyptic number.

1216216424318 is a deficient number, since it is larger than the sum of its proper divisors (874912798306).

1216216424318 is a wasteful number, since it uses less digits than its factorization.

1216216424318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257782547.

The product of its digits is 110592, while the sum is 41.

The spelling of 1216216424318 in words is "one trillion, two hundred sixteen billion, two hundred sixteen million, four hundred twenty-four thousand, three hundred eighteen".