121221202001001 has 16 divisors (see below), whose sum is σ = 166843858521600. Its totient is φ = 78206395512960.

The previous prime is 121221202000993. The next prime is 121221202001023. The reversal of 121221202001001 is 100100202122121.

It is not a de Polignac number, because 121221202001001 - 2³ = 121221202000993 is a prime.

It is a super-3 number, since 3×121221202001001³ (a number of 43 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (121221202001041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1923925 + ... + 15688973.

It is an arithmetic number, because the mean of its divisors is an integer number (10427741157600).

Almost surely, 2^{121221202001001} is an apocalyptic number.

It is an amenable number.

121221202001001 is a deficient number, since it is larger than the sum of its proper divisors (45622656520599).

121221202001001 is a wasteful number, since it uses less digits than its factorization.

121221202001001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13859776.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121221202001001 its reverse (100100202122121), we get a palindrome (221321404123122).

The spelling of 121221202001001 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, two hundred two million, one thousand, one".