203012013021 has 4 divisors (see below), whose sum is σ = 270682684032. Its totient is φ = 135341342012.

The previous prime is 203012013011. The next prime is 203012013037. The reversal of 203012013021 is 120310210302.

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 203012013021 - 2⁷ = 203012012893 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203012013011) 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, 33835335501 + ... + 33835335506.

It is an arithmetic number, because the mean of its divisors is an integer number (67670671008).

Almost surely, 2^203012013021 is an apocalyptic number.

It is an amenable number.

203012013021 is a deficient number, since it is larger than the sum of its proper divisors (67670671011).

203012013021 is an equidigital number, since it uses as much as digits as its factorization.

203012013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67670671010.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 203012013021 its reverse (120310210302), we get a palindrome (323322223323).

The spelling of 203012013021 in words is "two hundred three billion, twelve million, thirteen thousand, twenty-one".