203340543021 has 128 divisors (see below), whose sum is σ = 401327308800. Its totient is φ = 98503879680.

The previous prime is 203340542971. The next prime is 203340543023. The reversal of 203340543021 is 120345043302.

203340543021 is a `hidden beast` number, since 20 + 334 + 0 + 5 + 4 + 302 + 1 = 666.

It is not a de Polignac number, because 203340543021 - 2¹³ = 203340534829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203340543023) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 3825996 + ... + 3878778.

It is an arithmetic number, because the mean of its divisors is an integer number (3135369600).

Almost surely, 2^203340543021 is an apocalyptic number.

203340543021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

203340543021 is a deficient number, since it is larger than the sum of its proper divisors (197986765779).

203340543021 is a wasteful number, since it uses less digits than its factorization.

203340543021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52936 (or 52930 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 27.

Adding to 203340543021 its reverse (120345043302), we get a palindrome (323685586323).

The spelling of 203340543021 in words is "two hundred three billion, three hundred forty million, five hundred forty-three thousand, twenty-one".