1212211212210 has 96 divisors (see below), whose sum is σ = 3183512407920. Its totient is φ = 319999680000.

The previous prime is 1212211212197. The next prime is 1212211212227. The reversal of 1212211212210 is 122121122121.

1212211212210 is a `hidden beast` number, since 1 + 21 + 221 + 1 + 212 + 210 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1162909894689 + 49301317521 = 1078383^2 + 222039^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 89993356 + ... + 90006824.

Almost surely, 2^{1212211212210} is an apocalyptic number.

1212211212210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212211212210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1591756203960).

1212211212210 is an abundant number, since it is smaller than the sum of its proper divisors (1971301195710).

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

1212211212210 is a wasteful number, since it uses less digits than its factorization.

1212211212210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23484 (or 23481 counting only the distinct ones).

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

Adding to 1212211212210 its reverse (122121122121), we get a palindrome (1334332334331).

The spelling of 1212211212210 in words is "one trillion, two hundred twelve billion, two hundred eleven million, two hundred twelve thousand, two hundred ten".