204101021 has 4 divisors (see below), whose sum is σ = 214843200. Its totient is φ = 193358844.

The previous prime is 204100987. The next prime is 204101033. The reversal of 204101021 is 120101402.

204101021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120101402 = 2 ⋅60050701.

It is a cyclic number.

It is not a de Polignac number, because 204101021 - 2⁶ = 204100957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204100993 and 204101011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204101041) 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, 5371061 + ... + 5371098.

It is an arithmetic number, because the mean of its divisors is an integer number (53710800).

Almost surely, 2^204101021 is an apocalyptic number.

It is an amenable number.

204101021 is a deficient number, since it is larger than the sum of its proper divisors (10742179).

204101021 is a wasteful number, since it uses less digits than its factorization.

204101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10742178.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 204101021 is about 14286.3928617409. The cubic root of 204101021 is about 588.7736867182.

Adding to 204101021 its reverse (120101402), we get a palindrome (324202423).

The spelling of 204101021 in words is "two hundred four million, one hundred one thousand, twenty-one".