20003203121 has 8 divisors (see below), whose sum is σ = 21822804864. Its totient is φ = 18183789520.

The previous prime is 20003203057. The next prime is 20003203139. The reversal of 20003203121 is 12130230002.

It is a happy number.

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 20003203121 - 2⁶ = 20003203057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20003203096 and 20003203105.

It is not an unprimeable number, because it can be changed into a prime (20003203151) 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, 265736 + ... + 332598.

It is an arithmetic number, because the mean of its divisors is an integer number (2727850608).

Almost surely, 2^20003203121 is an apocalyptic number.

It is an amenable number.

20003203121 is a deficient number, since it is larger than the sum of its proper divisors (1819601743).

20003203121 is a wasteful number, since it uses less digits than its factorization.

20003203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94071.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 20003203121 its reverse (12130230002), we get a palindrome (32133433123).

The spelling of 20003203121 in words is "twenty billion, three million, two hundred three thousand, one hundred twenty-one".