121221222002001 has 40 divisors (see below), whose sum is σ = 197547431434848. Its totient is φ = 73466761536000.

The previous prime is 121221222001973. The next prime is 121221222002009. The reversal of 121221222002001 is 100200222122121.

It is a happy number.

121221222002001 is a `hidden beast` number, since 1 + 21 + 221 + 2 + 220 + 0 + 200 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-121221222002001 is a prime.

It is a super-2 number, since 2×121221222002001² (a number of 29 digits) contains 22 as substring.

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 39 ways as a sum of consecutive naturals, for example, 112917681 + ... + 113986161.

Almost surely, 2^{121221222002001} is an apocalyptic number.

121221222002001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121221222002001 is a deficient number, since it is larger than the sum of its proper divisors (76326209432847).

121221222002001 is a wasteful number, since it uses less digits than its factorization.

121221222002001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195835 (or 1195826 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 121221222002001 its reverse (100200222122121), we get a palindrome (221421444124122).

The spelling of 121221222002001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-two million, two thousand, one".