1212210212220 has 144 divisors (see below), whose sum is σ = 4202607235008. Its totient is φ = 277058257920.

The previous prime is 1212210212189. The next prime is 1212210212231. The reversal of 1212210212220 is 222120122121.

It is a happy number.

1212210212220 is a `hidden beast` number, since 1 + 21 + 2 + 210 + 212 + 220 = 666.

It is a super-2 number, since 2×1212210212220² (a number of 25 digits) contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 1212210212193 and 1212210212202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 30871800 + ... + 30911040.

Almost surely, 2^{1212210212220} is an apocalyptic number.

1212210212220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212210212220 is an abundant number, since it is smaller than the sum of its proper divisors (2990397022788).

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

1212210212220 is a wasteful number, since it uses less digits than its factorization.

1212210212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63780 (or 63775 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 1212210212220 its reverse (222120122121), we get a palindrome (1434330334341).

Subtracting from 1212210212220 its reverse (222120122121), we obtain a palindrome (990090090099).

The spelling of 1212210212220 in words is "one trillion, two hundred twelve billion, two hundred ten million, two hundred twelve thousand, two hundred twenty".