203421320356605 has 64 divisors (see below), whose sum is σ = 356977969931520. Its totient is φ = 98303070468096.

The previous prime is 203421320356577. The next prime is 203421320356687. The reversal of 203421320356605 is 506653023124302.

203421320356605 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 203421320356605 - 2²⁸ = 203421051921149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5269552 + ... + 20847321.

It is an arithmetic number, because the mean of its divisors is an integer number (5577780780180).

Almost surely, 2^{203421320356605} is an apocalyptic number.

It is an amenable number.

203421320356605 is a deficient number, since it is larger than the sum of its proper divisors (153556649574915).

203421320356605 is a wasteful number, since it uses less digits than its factorization.

203421320356605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26117630.

The product of its (nonzero) digits is 777600, while the sum is 42.

The spelling of 203421320356605 in words is "two hundred three trillion, four hundred twenty-one billion, three hundred twenty million, three hundred fifty-six thousand, six hundred five".