204524121221 has 8 divisors (see below), whose sum is σ = 233747145984. Its totient is φ = 175302419760.

The previous prime is 204524121133. The next prime is 204524121239. The reversal of 204524121221 is 122121425402.

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 204524121221 - 2³⁴ = 187344252037 is a prime.

It is a super-2 number, since 2×204524121221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204524121281) 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, 26036 + ... + 640098.

It is an arithmetic number, because the mean of its divisors is an integer number (29218393248).

Almost surely, 2^204524121221 is an apocalyptic number.

It is an amenable number.

204524121221 is a deficient number, since it is larger than the sum of its proper divisors (29223024763).

204524121221 is an equidigital number, since it uses as much as digits as its factorization.

204524121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661651.

The product of its (nonzero) digits is 2560, while the sum is 26.

Adding to 204524121221 its reverse (122121425402), we get a palindrome (326645546623).

It can be divided in two parts, 204 and 524121221, that added together give a palindrome (524121425).

The spelling of 204524121221 in words is "two hundred four billion, five hundred twenty-four million, one hundred twenty-one thousand, two hundred twenty-one".