1221400041220 has 12 divisors (see below), whose sum is σ = 2564940086604. Its totient is φ = 488560016480.

The previous prime is 1221400041107. The next prime is 1221400041223. The reversal of 1221400041220 is 221400041221.

It can be written as a sum of positive squares in 2 ways, for example, as 852154226884 + 369245814336 = 923122^2 + 607656^2 .

It is not an unprimeable number, because it can be changed into a prime (1221400041223) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 30535001011 + ... + 30535001050.

It is an arithmetic number, because the mean of its divisors is an integer number (213745007217).

Almost surely, 2^{1221400041220} is an apocalyptic number.

1221400041220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1221400041220 is an abundant number, since it is smaller than the sum of its proper divisors (1343540045384).

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

1221400041220 is a wasteful number, since it uses less digits than its factorization.

1221400041220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61070002070 (or 61070002068 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 1221400041220 its reverse (221400041221), we get a palindrome (1442800082441).

Subtracting from 1221400041220 its reverse (221400041221), we obtain a palindrome (999999999999).

The spelling of 1221400041220 in words is "one trillion, two hundred twenty-one billion, four hundred million, forty-one thousand, two hundred twenty".