1228721884515 has 32 divisors (see below), whose sum is σ = 2185161331200. Its totient is φ = 655088277600.

The previous prime is 1228721884483. The next prime is 1228721884543. The reversal of 1228721884515 is 5154881278221.

1228721884515 is a `hidden beast` number, since 1 + 2 + 2 + 8 + 7 + 2 + 188 + 451 + 5 = 666.

It is not a de Polignac number, because 1228721884515 - 2⁵ = 1228721884483 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1211335 + ... + 1981104.

It is an arithmetic number, because the mean of its divisors is an integer number (68286291600).

Almost surely, 2^{1228721884515} is an apocalyptic number.

1228721884515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1228721884515 is a deficient number, since it is larger than the sum of its proper divisors (956439446685).

1228721884515 is a wasteful number, since it uses less digits than its factorization.

1228721884515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195304 (or 3195298 counting only the distinct ones).

The product of its digits is 2867200, while the sum is 54.

The spelling of 1228721884515 in words is "one trillion, two hundred twenty-eight billion, seven hundred twenty-one million, eight hundred eighty-four thousand, five hundred fifteen".