204221042121 has 8 divisors (see below), whose sum is σ = 272330011360. Its totient is φ = 136129717152.

The previous prime is 204221042111. The next prime is 204221042131. The reversal of 204221042121 is 121240122402.

It is an interprime number because it is at equal distance from previous prime (204221042111) and next prime (204221042131).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 204221042121 - 2¹¹ = 204221040073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204221042101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4384036 + ... + 4430373.

It is an arithmetic number, because the mean of its divisors is an integer number (34041251420).

Almost surely, 2^204221042121 is an apocalyptic number.

It is an amenable number.

204221042121 is a deficient number, since it is larger than the sum of its proper divisors (68108969239).

204221042121 is an equidigital number, since it uses as much as digits as its factorization.

204221042121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8822135.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 204221042121 its reverse (121240122402), we get a palindrome (325461164523).

The spelling of 204221042121 in words is "two hundred four billion, two hundred twenty-one million, forty-two thousand, one hundred twenty-one".