1221400335112 has 48 divisors (see below), whose sum is σ = 2438944457940. Its totient is φ = 571452315648.

The previous prime is 1221400335107. The next prime is 1221400335137. The reversal of 1221400335112 is 2115330041221.

It can be written as a sum of positive squares in 6 ways, for example, as 1068217334116 + 153183000996 = 1033546^2 + 391386^2 .

It is a super-2 number, since 2×1221400335112² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3920308 + ... + 4220380.

Almost surely, 2^{1221400335112} is an apocalyptic number.

It is an amenable number.

1221400335112 is a deficient number, since it is larger than the sum of its proper divisors (1217544122828).

1221400335112 is a wasteful number, since it uses less digits than its factorization.

1221400335112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300442 (or 300265 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 1221400335112 its reverse (2115330041221), we get a palindrome (3336730376333).

The spelling of 1221400335112 in words is "one trillion, two hundred twenty-one billion, four hundred million, three hundred thirty-five thousand, one hundred twelve".