203020021121 has 4 divisors (see below), whose sum is σ = 203021790000. Its totient is φ = 203018252244.

The previous prime is 203020021117. The next prime is 203020021181. The reversal of 203020021121 is 121120020302.

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, and also an emirpimes, since its reverse is a distinct semiprime: 121120020302 = 2 ⋅60560010151.

It is a cyclic number.

It is not a de Polignac number, because 203020021121 - 2² = 203020021117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203020021096 and 203020021105.

It is not an unprimeable number, because it can be changed into a prime (203020021181) 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, 699371 + ... + 946128.

It is an arithmetic number, because the mean of its divisors is an integer number (50755447500).

Almost surely, 2^203020021121 is an apocalyptic number.

It is an amenable number.

203020021121 is a deficient number, since it is larger than the sum of its proper divisors (1768879).

203020021121 is a wasteful number, since it uses less digits than its factorization.

203020021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768878.

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

Adding to 203020021121 its reverse (121120020302), we get a palindrome (324140041423).

The spelling of 203020021121 in words is "two hundred three billion, twenty million, twenty-one thousand, one hundred twenty-one".