203200121021 has 4 divisors (see below), whose sum is σ = 203210191200. Its totient is φ = 203190050844.

The previous prime is 203200121011. The next prime is 203200121071. The reversal of 203200121021 is 120121002302.

It is a happy number.

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 203200121021 - 2¹⁴ = 203200104637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203200120987 and 203200121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203200121011) 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, 5004761 + ... + 5045198.

It is an arithmetic number, because the mean of its divisors is an integer number (50802547800).

Almost surely, 2^203200121021 is an apocalyptic number.

It is an amenable number.

203200121021 is a deficient number, since it is larger than the sum of its proper divisors (10070179).

203200121021 is a wasteful number, since it uses less digits than its factorization.

203200121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10070178.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 203200121021 its reverse (120121002302), we get a palindrome (323321123323).

The spelling of 203200121021 in words is "two hundred three billion, two hundred million, one hundred twenty-one thousand, twenty-one".