121221222002004 has 48 divisors (see below), whose sum is σ = 283003836514560. Its totient is φ = 40385029695360.

The previous prime is 121221222001973. The next prime is 121221222002009. The reversal of 121221222002004 is 400200222122121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221222002009) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1368310942 + ... + 1368399530.

It is an arithmetic number, because the mean of its divisors is an integer number (5895913260720).

Almost surely, 2^{121221222002004} is an apocalyptic number.

It is an amenable number.

121221222002004 is an abundant number, since it is smaller than the sum of its proper divisors (161782614512556).

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

121221222002004 is a wasteful number, since it uses less digits than its factorization.

121221222002004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149520 (or 149518 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 121221222002004 its reverse (400200222122121), we get a palindrome (521421444124125).

The spelling of 121221222002004 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, four".