203331020021 has 4 divisors (see below), whose sum is σ = 204883165344. Its totient is φ = 201778874700.

The previous prime is 203331020003. The next prime is 203331020023. The reversal of 203331020021 is 120020133302.

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 a de Polignac number, because none of the positive numbers 2^k-203331020021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203331020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 776072465 + ... + 776072726.

It is an arithmetic number, because the mean of its divisors is an integer number (51220791336).

Almost surely, 2^203331020021 is an apocalyptic number.

It is an amenable number.

203331020021 is a deficient number, since it is larger than the sum of its proper divisors (1552145323).

203331020021 is a wasteful number, since it uses less digits than its factorization.

203331020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1552145322.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 203331020021 its reverse (120020133302), we get a palindrome (323351153323).

The spelling of 203331020021 in words is "two hundred three billion, three hundred thirty-one million, twenty thousand, twenty-one".