204121023355 has 8 divisors (see below), whose sum is σ = 251565369552. Its totient is φ = 158883391008.

The previous prime is 204121023343. The next prime is 204121023367. The reversal of 204121023355 is 553320121402.

It is an interprime number because it is at equal distance from previous prime (204121023343) and next prime (204121023367).

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 204121023355 - 2¹⁹ = 204120499067 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 551678257 + ... + 551678626.

It is an arithmetic number, because the mean of its divisors is an integer number (31445671194).

Almost surely, 2^204121023355 is an apocalyptic number.

204121023355 is a deficient number, since it is larger than the sum of its proper divisors (47444346197).

204121023355 is a wasteful number, since it uses less digits than its factorization.

204121023355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1103356925.

The product of its (nonzero) digits is 7200, while the sum is 28.

Adding to 204121023355 its reverse (553320121402), we get a palindrome (757441144757).

The spelling of 204121023355 in words is "two hundred four billion, one hundred twenty-one million, twenty-three thousand, three hundred fifty-five".