1216425312135 has 96 divisors (see below), whose sum is σ = 2326735756800. Its totient is φ = 583004217600.

The previous prime is 1216425312097. The next prime is 1216425312139. The reversal of 1216425312135 is 5312135246121.

1216425312135 is a `hidden beast` number, since 1 + 2 + 1 + 642 + 5 + 3 + 1 + 2 + 1 + 3 + 5 = 666.

It is not a de Polignac number, because 1216425312135 - 2¹³ = 1216425303943 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1216425312135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216425312139) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14921716 + ... + 15003014.

It is an arithmetic number, because the mean of its divisors is an integer number (24236830800).

Almost surely, 2^{1216425312135} is an apocalyptic number.

1216425312135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1216425312135 is a deficient number, since it is larger than the sum of its proper divisors (1110310444665).

1216425312135 is a wasteful number, since it uses less digits than its factorization.

1216425312135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81669 (or 81666 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The spelling of 1216425312135 in words is "one trillion, two hundred sixteen billion, four hundred twenty-five million, three hundred twelve thousand, one hundred thirty-five".