1212136512 has 56 divisors (see below), whose sum is σ = 3212299392. Its totient is φ = 403392000.

The previous prime is 1212136511. The next prime is 1212136529. The reversal of 1212136512 is 2156312121.

It is a happy number.

It is a super-2 number, since 2×1212136512² = 2938549847447052288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (1212136511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122137 + ... + 131687.

Almost surely, 2^1212136512 is an apocalyptic number.

1212136512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1212136512 is an abundant number, since it is smaller than the sum of its proper divisors (2000162880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212136512 is an equidigital number, since it uses as much as digits as its factorization.

1212136512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10227 (or 10217 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 1212136512 is about 34815.7509182267. The cubic root of 1212136512 is about 1066.2290503469.

Adding to 1212136512 its reverse (2156312121), we get a palindrome (3368448633).

The spelling of 1212136512 in words is "one billion, two hundred twelve million, one hundred thirty-six thousand, five hundred twelve".