200121122110021 has 4 divisors (see below), whose sum is σ = 228709853840032. Its totient is φ = 171532390380012.

The previous prime is 200121122109949. The next prime is 200121122110057. The reversal of 200121122110021 is 120011221121002.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200121122110021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121122109977 and 200121122110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121122110061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14294365864995 + ... + 14294365865008.

It is an arithmetic number, because the mean of its divisors is an integer number (57177463460008).

Almost surely, 2^{200121122110021} is an apocalyptic number.

It is an amenable number.

200121122110021 is a deficient number, since it is larger than the sum of its proper divisors (28588731730011).

200121122110021 is an equidigital number, since it uses as much as digits as its factorization.

200121122110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28588731730010.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 200121122110021 its reverse (120011221121002), we get a palindrome (320132343231023).

The spelling of 200121122110021 in words is "two hundred trillion, one hundred twenty-one billion, one hundred twenty-two million, one hundred ten thousand, twenty-one".