205500552421 has 8 divisors (see below), whose sum is σ = 216402658560. Its totient is φ = 194762387952.

The previous prime is 205500552409. The next prime is 205500552473. The reversal of 205500552421 is 124255005502.

It is a happy number.

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 205500552421 - 2³¹ = 203353068773 is a prime.

It is a super-2 number, since 2×205500552421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205500553421) 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, 40982845 + ... + 40987858.

It is an arithmetic number, because the mean of its divisors is an integer number (27050332320).

Almost surely, 2^205500552421 is an apocalyptic number.

It is an amenable number.

205500552421 is a deficient number, since it is larger than the sum of its proper divisors (10902106139).

205500552421 is a wasteful number, since it uses less digits than its factorization.

205500552421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81970835.

The product of its (nonzero) digits is 20000, while the sum is 31.

Adding to 205500552421 its reverse (124255005502), we get a palindrome (329755557923).

The spelling of 205500552421 in words is "two hundred five billion, five hundred million, five hundred fifty-two thousand, four hundred twenty-one".