200121011021 has 4 divisors (see below), whose sum is σ = 200585329344. Its totient is φ = 199656692700.

The previous prime is 200121011003. The next prime is 200121011023. The reversal of 200121011021 is 120110121002.

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 not a de Polignac number, because 200121011021 - 2¹⁰ = 200121009997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 200121010993 and 200121011011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121011023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232158515 + ... + 232159376.

It is an arithmetic number, because the mean of its divisors is an integer number (50146332336).

Almost surely, 2^200121011021 is an apocalyptic number.

It is an amenable number.

200121011021 is a deficient number, since it is larger than the sum of its proper divisors (464318323).

200121011021 is an equidigital number, since it uses as much as digits as its factorization.

200121011021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464318322.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 200121011021 its reverse (120110121002), we get a palindrome (320231132023).

The spelling of 200121011021 in words is "two hundred billion, one hundred twenty-one million, eleven thousand, twenty-one".