1212200001220 has 24 divisors (see below), whose sum is σ = 2741436926424. Its totient is φ = 447581538816.

The previous prime is 1212200001193. The next prime is 1212200001269. The reversal of 1212200001220 is 221000022121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 161456097856 + 1050743903364 = 401816^2 + 1025058^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 1212200001220.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2331153589 + ... + 2331154108.

It is an arithmetic number, because the mean of its divisors is an integer number (114226538601).

Almost surely, 2^{1212200001220} is an apocalyptic number.

1212200001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1212200001220 is an abundant number, since it is smaller than the sum of its proper divisors (1529236925204).

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

1212200001220 is a wasteful number, since it uses less digits than its factorization.

1212200001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662307719 (or 4662307717 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1212200001220 its reverse (221000022121), we get a palindrome (1433200023341).

The spelling of 1212200001220 in words is "one trillion, two hundred twelve billion, two hundred million, one thousand, two hundred twenty".