1212103321220 has 36 divisors (see below), whose sum is σ = 2797855027212. Its totient is φ = 440764843200.

The previous prime is 1212103321201. The next prime is 1212103321237. The reversal of 1212103321220 is 221233012121.

It can be written as a sum of positive squares in 2 ways, for example, as 531333113476 + 680770207744 = 728926^2 + 825088^2 .

It is a super-2 number, since 2×1212103321220² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 1212103321192 and 1212103321201.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 250432151 + ... + 250436990.

Almost surely, 2^{1212103321220} is an apocalyptic number.

1212103321220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212103321220 is an abundant number, since it is smaller than the sum of its proper divisors (1585751705992).

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

1212103321220 is a wasteful number, since it uses less digits than its factorization.

1212103321220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500869172 (or 500869159 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1212103321220 its reverse (221233012121), we get a palindrome (1433336333341).

The spelling of 1212103321220 in words is "one trillion, two hundred twelve billion, one hundred three million, three hundred twenty-one thousand, two hundred twenty".