1216213635515 has 16 divisors (see below), whose sum is σ = 1476547968000. Its totient is φ = 961639286112.

The previous prime is 1216213635509. The next prime is 1216213635517. The reversal of 1216213635515 is 5155363126121.

It is a cyclic number.

It is not a de Polignac number, because 1216213635515 - 2¹⁸ = 1216213373371 is a prime.

It is a super-2 number, since 2×1216213635515² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1216213635517) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3768665 + ... + 4078634.

It is an arithmetic number, because the mean of its divisors is an integer number (92284248000).

Almost surely, 2^{1216213635515} is an apocalyptic number.

1216213635515 is a deficient number, since it is larger than the sum of its proper divisors (260334332485).

1216213635515 is a wasteful number, since it uses less digits than its factorization.

1216213635515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847666.

The product of its digits is 162000, while the sum is 41.

The spelling of 1216213635515 in words is "one trillion, two hundred sixteen billion, two hundred thirteen million, six hundred thirty-five thousand, five hundred fifteen".