221121000202001 has 32 divisors (see below), whose sum is σ = 230223878776320. Its totient is φ = 212205986092800.

The previous prime is 221121000201973. The next prime is 221121000202009. The reversal of 221121000202001 is 100202000121122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221121000202001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221121000202009) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15418792091 + ... + 15418806431.

It is an arithmetic number, because the mean of its divisors is an integer number (7194496211760).

Almost surely, 2^{221121000202001} is an apocalyptic number.

It is an amenable number.

221121000202001 is a deficient number, since it is larger than the sum of its proper divisors (9102878574319).

221121000202001 is a wasteful number, since it uses less digits than its factorization.

221121000202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20457.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 221121000202001 its reverse (100202000121122), we get a palindrome (321323000323123).

The spelling of 221121000202001 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred two thousand, one".