202525421221 has 8 divisors (see below), whose sum is σ = 208005543800. Its totient is φ = 197045638848.

The previous prime is 202525421201. The next prime is 202525421237. The reversal of 202525421221 is 122124525202.

It can be written as a sum of positive squares in 4 ways, for example, as 24959260225 + 177566160996 = 157985^2 + 421386^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 202525421221 - 2¹³ = 202525413029 is a prime.

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 202525421221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202525421201) 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, 1531855 + ... + 1658803.

It is an arithmetic number, because the mean of its divisors is an integer number (26000692975).

Almost surely, 2^202525421221 is an apocalyptic number.

It is an amenable number.

202525421221 is a deficient number, since it is larger than the sum of its proper divisors (5480122579).

202525421221 is a wasteful number, since it uses less digits than its factorization.

202525421221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170103.

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 202525421221 its reverse (122124525202), we get a palindrome (324649946423).

The spelling of 202525421221 in words is "two hundred two billion, five hundred twenty-five million, four hundred twenty-one thousand, two hundred twenty-one".