1212103721504 has 48 divisors (see below), whose sum is σ = 2721063178008. Its totient is φ = 526524690432.

The previous prime is 1212103721503. The next prime is 1212103721551. The reversal of 1212103721504 is 4051273012121.

It can be written as a sum of positive squares in 4 ways, for example, as 1013348249104 + 198755472400 = 1006652^2 + 445820^2 .

It is not an unprimeable number, because it can be changed into a prime (1212103721503) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 85690307 + ... + 85704450.

Almost surely, 2^{1212103721504} is an apocalyptic number.

It is an amenable number.

1212103721504 is an abundant number, since it is smaller than the sum of its proper divisors (1508959456504).

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

1212103721504 is a wasteful number, since it uses less digits than its factorization.

1212103721504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171394797 (or 171394789 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 1212103721504 its reverse (4051273012121), we get a palindrome (5263376733625).

The spelling of 1212103721504 in words is "one trillion, two hundred twelve billion, one hundred three million, seven hundred twenty-one thousand, five hundred four".