1212121170 has 48 divisors (see below), whose sum is σ = 3393942552. Its totient is φ = 298368000.

The previous prime is 1212121153. The next prime is 1212121177. The reversal of 1212121170 is 711212121.

It can be written as a sum of positive squares in 4 ways, for example, as 1076561721 + 135559449 = 32811^2 + 11643^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1212121177) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 516831 + ... + 519170.

Almost surely, 2^1212121170 is an apocalyptic number.

1212121170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212121170 is an abundant number, since it is smaller than the sum of its proper divisors (2181821382).

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

1212121170 is a wasteful number, since it uses less digits than its factorization.

1212121170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1036027 (or 1036024 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 1212121170 is about 34815.5305862197. The cubic root of 1212121170 is about 1066.2245519110.

Adding to 1212121170 its reverse (711212121), we get a palindrome (1923333291).

The spelling of 1212121170 in words is "one billion, two hundred twelve million, one hundred twenty-one thousand, one hundred seventy".