1220221220000 has 60 divisors (see below), whose sum is σ = 3001927283586. Its totient is φ = 488088480000.

The previous prime is 1220221219913. The next prime is 1220221220017. The reversal of 1220221220000 is 221220221.

It can be written as a sum of positive squares in 5 ways, for example, as 672053776 + 1219549166224 = 25924^2 + 1104332^2 .

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 9 ways as a sum of consecutive naturals, for example, 30485531 + ... + 30525530.

Almost surely, 2^{1220221220000} is an apocalyptic number.

1220221220000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1220221220000 is an abundant number, since it is smaller than the sum of its proper divisors (1781706063586).

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

1220221220000 is an frugal number, since it uses more digits than its factorization.

1220221220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61011091 (or 61011068 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 1220221220000 its reverse (221220221), we get a palindrome (1220442440221).

The spelling of 1220221220000 in words is "one trillion, two hundred twenty billion, two hundred twenty-one million, two hundred twenty thousand".