204421155403 has 4 divisors (see below), whose sum is σ = 205480332568. Its totient is φ = 203361978240.

The previous prime is 204421155373. The next prime is 204421155427. The reversal of 204421155403 is 304551124402.

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 204421155403 - 2⁹ = 204421154891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204421855403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 529588293 + ... + 529588678.

It is an arithmetic number, because the mean of its divisors is an integer number (51370083142).

Almost surely, 2^204421155403 is an apocalyptic number.

204421155403 is a deficient number, since it is larger than the sum of its proper divisors (1059177165).

204421155403 is a wasteful number, since it uses less digits than its factorization.

204421155403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059177164.

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 204421155403 its reverse (304551124402), we get a palindrome (508972279805).

The spelling of 204421155403 in words is "two hundred four billion, four hundred twenty-one million, one hundred fifty-five thousand, four hundred three".