205410403155421 has 8 divisors (see below), whose sum is σ = 205897031857664. Its totient is φ = 204923830858560.

The previous prime is 205410403155253. The next prime is 205410403155427. The reversal of 205410403155421 is 124551304014502.

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 205410403155421 - 2²³ = 205410394766813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205410403155427) 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, 6804891 + ... + 21380536.

It is an arithmetic number, because the mean of its divisors is an integer number (25737128982208).

Almost surely, 2^{205410403155421} is an apocalyptic number.

It is an amenable number.

205410403155421 is a deficient number, since it is larger than the sum of its proper divisors (486628702243).

205410403155421 is a wasteful number, since it uses less digits than its factorization.

205410403155421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28202691.

The product of its (nonzero) digits is 96000, while the sum is 37.

Adding to 205410403155421 its reverse (124551304014502), we get a palindrome (329961707169923).

The spelling of 205410403155421 in words is "two hundred five trillion, four hundred ten billion, four hundred three million, one hundred fifty-five thousand, four hundred twenty-one".