203201020021 has 4 divisors (see below), whose sum is σ = 203216059872. Its totient is φ = 203185980172.

The previous prime is 203201019961. The next prime is 203201020039. The reversal of 203201020021 is 120020102302.

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: 120020102302 = 2 ⋅60010051151.

It is a cyclic number.

It is not a de Polignac number, because 203201020021 - 2⁷ = 203201019893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 203201019983 and 203201020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203201000021) 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, 7499641 + ... + 7526686.

It is an arithmetic number, because the mean of its divisors is an integer number (50804014968).

Almost surely, 2^203201020021 is an apocalyptic number.

It is an amenable number.

203201020021 is a deficient number, since it is larger than the sum of its proper divisors (15039851).

203201020021 is a wasteful number, since it uses less digits than its factorization.

203201020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15039850.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 203201020021 its reverse (120020102302), we get a palindrome (323221122323).

The spelling of 203201020021 in words is "two hundred three billion, two hundred one million, twenty thousand, twenty-one".