1212121212210 has 80 divisors (see below), whose sum is σ = 3400966236096. Its totient is φ = 309178739232.

The previous prime is 1212121212199. The next prime is 1212121212229. The reversal of 1212121212210 is 122121212121.

1212121212210 is a `hidden beast` number, since 121 + 2 + 121 + 212 + 210 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 32512804 + ... + 32550063.

Almost surely, 2^{1212121212210} is an apocalyptic number.

1212121212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1212121212210 is an abundant number, since it is smaller than the sum of its proper divisors (2188845023886).

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

1212121212210 is a wasteful number, since it uses less digits than its factorization.

1212121212210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65062909 (or 65062900 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1212121212210 its reverse (122121212121), we get a palindrome (1334242424331).

The spelling of 1212121212210 in words is "one trillion, two hundred twelve billion, one hundred twenty-one million, two hundred twelve thousand, two hundred ten".