200121220100021 has 8 divisors (see below), whose sum is σ = 218377027486944. Its totient is φ = 181875907579120.

The previous prime is 200121220100017. The next prime is 200121220100051. The reversal of 200121220100021 is 120001022121002.

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 200121220100021 - 2² = 200121220100017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121220099969 and 200121220100005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121220100051) 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, 2623676630 + ... + 2623752903.

It is an arithmetic number, because the mean of its divisors is an integer number (27297128435868).

Almost surely, 2^{200121220100021} is an apocalyptic number.

It is an amenable number.

200121220100021 is a deficient number, since it is larger than the sum of its proper divisors (18255807386923).

200121220100021 is a wasteful number, since it uses less digits than its factorization.

200121220100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5247433011.

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

Adding to 200121220100021 its reverse (120001022121002), we get a palindrome (320122242221023).

The spelling of 200121220100021 in words is "two hundred trillion, one hundred twenty-one billion, two hundred twenty million, one hundred thousand, twenty-one".