205421495 has 4 divisors (see below), whose sum is σ = 246505800. Its totient is φ = 164337192.

The previous prime is 205421479. The next prime is 205421501. The reversal of 205421495 is 594124502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 205421495 - 2⁴ = 205421479 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20542145 + ... + 20542154.

It is an arithmetic number, because the mean of its divisors is an integer number (61626450).

Almost surely, 2^205421495 is an apocalyptic number.

205421495 is a deficient number, since it is larger than the sum of its proper divisors (41084305).

205421495 is an equidigital number, since it uses as much as digits as its factorization.

205421495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41084304.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 205421495 is about 14332.5327489596. The cubic root of 205421495 is about 590.0406895236.

Adding to 205421495 its reverse (594124502), we get a palindrome (799545997).

The spelling of 205421495 in words is "two hundred five million, four hundred twenty-one thousand, four hundred ninety-five".