203202021221 has 8 divisors (see below), whose sum is σ = 211498618080. Its totient is φ = 194991399792.

The previous prime is 203202021193. The next prime is 203202021227. The reversal of 203202021221 is 122120202302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-203202021221 is a prime.

It is a super-2 number, since 2×203202021221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 203202021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (203202021227) 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, 21489035 + ... + 21498488.

It is an arithmetic number, because the mean of its divisors is an integer number (26437327260).

Almost surely, 2^203202021221 is an apocalyptic number.

It is an amenable number.

203202021221 is a deficient number, since it is larger than the sum of its proper divisors (8296596859).

203202021221 is a wasteful number, since it uses less digits than its factorization.

203202021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42987715.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 203202021221 its reverse (122120202302), we get a palindrome (325322223523).

The spelling of 203202021221 in words is "two hundred three billion, two hundred two million, twenty-one thousand, two hundred twenty-one".