1221220121122 has 8 divisors (see below), whose sum is σ = 1832793801372. Its totient is φ = 610288854000.

The previous prime is 1221220121089. The next prime is 1221220121137. The reversal of 1221220121122 is 2211210221221.

It can be written as a sum of positive squares in 2 ways, for example, as 1206155259001 + 15064862121 = 1098251^2 + 122739^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1221220121122.

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 3 ways as a sum of consecutive naturals, for example, 160598529 + ... + 160606132.

Almost surely, 2^{1221220121122} is an apocalyptic number.

1221220121122 is a deficient number, since it is larger than the sum of its proper divisors (611573680250).

1221220121122 is a wasteful number, since it uses less digits than its factorization.

1221220121122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321206564.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1221220121122 its reverse (2211210221221), we get a palindrome (3432430342343).

The spelling of 1221220121122 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred twenty-two".