203245220421 has 6 divisors (see below), whose sum is σ = 293576429510. Its totient is φ = 135496813608.

The previous prime is 203245220413. The next prime is 203245220483. The reversal of 203245220421 is 124022542302.

203245220421 is a `hidden beast` number, since 2 + 0 + 3 + 2 + 452 + 204 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 109862417025 + 93382803396 = 331455^2 + 305586^2 .

It is not a de Polignac number, because 203245220421 - 2³ = 203245220413 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203245220021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11291401126 + ... + 11291401143.

Almost surely, 2^203245220421 is an apocalyptic number.

It is an amenable number.

203245220421 is a deficient number, since it is larger than the sum of its proper divisors (90331209089).

203245220421 is a wasteful number, since it uses less digits than its factorization.

203245220421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22582802275 (or 22582802272 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 203245220421 its reverse (124022542302), we get a palindrome (327267762723).

The spelling of 203245220421 in words is "two hundred three billion, two hundred forty-five million, two hundred twenty thousand, four hundred twenty-one".