221100202121021 has 8 divisors (see below), whose sum is σ = 234106233120000. Its totient is φ = 208094186317248.

The previous prime is 221100202121017. The next prime is 221100202121023. The reversal of 221100202121021 is 120121202001122.

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

It is a cyclic number.

It is not a de Polignac number, because 221100202121021 - 2² = 221100202121017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100202121023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41790230 + ... + 46782728.

It is an arithmetic number, because the mean of its divisors is an integer number (29263279140000).

Almost surely, 2^{221100202121021} is an apocalyptic number.

It is an amenable number.

221100202121021 is a deficient number, since it is larger than the sum of its proper divisors (13006030998979).

221100202121021 is a wasteful number, since it uses less digits than its factorization.

221100202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597603.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221100202121021 its reverse (120121202001122), we get a palindrome (341221404122143).

The spelling of 221100202121021 in words is "two hundred twenty-one trillion, one hundred billion, two hundred two million, one hundred twenty-one thousand, twenty-one".