1212121515 has 16 divisors (see below), whose sum is σ = 2115703296. Its totient is φ = 587695200.

The previous prime is 1212121489. The next prime is 1212121531. The reversal of 1212121515 is 5151212121.

It is not a de Polignac number, because 1212121515 - 2⁶ = 1212121451 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1212121491 and 1212121500.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3672931 + ... + 3673260.

It is an arithmetic number, because the mean of its divisors is an integer number (132231456).

Almost surely, 2^1212121515 is an apocalyptic number.

1212121515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1212121515 is a deficient number, since it is larger than the sum of its proper divisors (903581781).

1212121515 is a wasteful number, since it uses less digits than its factorization.

1212121515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7346210.

The product of its digits is 200, while the sum is 21.

The square root of 1212121515 is about 34815.5355409047. The cubic root of 1212121515 is about 1066.2246530690.

Adding to 1212121515 its reverse (5151212121), we get a palindrome (6363333636).

The spelling of 1212121515 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, five hundred fifteen".