1221000322004 has 12 divisors (see below), whose sum is σ = 2136767692500. Its totient is φ = 610495267008.

The previous prime is 1221000321973. The next prime is 1221000322063. The reversal of 1221000322004 is 4002230001221.

It can be written as a sum of positive squares in 2 ways, for example, as 496816341904 + 724183980100 = 704852^2 + 850990^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630179 + ... + 1684970.

It is an arithmetic number, because the mean of its divisors is an integer number (178063974375).

Almost surely, 2^{1221000322004} is an apocalyptic number.

It is an amenable number.

1221000322004 is a deficient number, since it is larger than the sum of its proper divisors (915767370496).

1221000322004 is a wasteful number, since it uses less digits than its factorization.

1221000322004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2447002 (or 2447000 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 1221000322004 its reverse (4002230001221), we get a palindrome (5223230323225).

The spelling of 1221000322004 in words is "one trillion, two hundred twenty-one billion, three hundred twenty-two thousand, four".