1212121516 has 24 divisors (see below), whose sum is σ = 2143787184. Its totient is φ = 599639040.

The previous prime is 1212121489. The next prime is 1212121531. The reversal of 1212121516 is 6151212121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181696 + ... + 188248.

It is an arithmetic number, because the mean of its divisors is an integer number (89324466).

Almost surely, 2^1212121516 is an apocalyptic number.

It is an amenable number.

1212121516 is a deficient number, since it is larger than the sum of its proper divisors (931665668).

1212121516 is a wasteful number, since it uses less digits than its factorization.

1212121516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7041 (or 7039 counting only the distinct ones).

The product of its digits is 240, while the sum is 22.

The square root of 1212121516 is about 34815.5355552661. The cubic root of 1212121516 is about 1066.2246533623.

Adding to 1212121516 its reverse (6151212121), we get a palindrome (7363333637).

The spelling of 1212121516 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, five hundred sixteen".