203421545 has 16 divisors (see below), whose sum is σ = 255491712. Its totient is φ = 155189760.

The previous prime is 203421529. The next prime is 203421551. The reversal of 203421545 is 545124302.

It is a happy number.

It is not a de Polignac number, because 203421545 - 2⁴ = 203421529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38090 + ... + 43100.

It is an arithmetic number, because the mean of its divisors is an integer number (15968232).

Almost surely, 2^203421545 is an apocalyptic number.

It is an amenable number.

203421545 is a deficient number, since it is larger than the sum of its proper divisors (52070167).

203421545 is a wasteful number, since it uses less digits than its factorization.

203421545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5392.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 203421545 is about 14262.5925062732. The cubic root of 203421545 is about 588.1195950066.

Adding to 203421545 its reverse (545124302), we get a palindrome (748545847).

The spelling of 203421545 in words is "two hundred three million, four hundred twenty-one thousand, five hundred forty-five".