202541221613 has 4 divisors (see below), whose sum is σ = 202842175068. Its totient is φ = 202240268160.

The previous prime is 202541221609. The next prime is 202541221621. The reversal of 202541221613 is 316122145202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22424164009 + 180117057604 = 149747^2 + 424402^2 .

It is a cyclic number.

It is not a de Polignac number, because 202541221613 - 2² = 202541221609 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202541221693) 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, 150475718 + ... + 150477063.

It is an arithmetic number, because the mean of its divisors is an integer number (50710543767).

Almost surely, 2^202541221613 is an apocalyptic number.

It is an amenable number.

202541221613 is a deficient number, since it is larger than the sum of its proper divisors (300953455).

202541221613 is an equidigital number, since it uses as much as digits as its factorization.

202541221613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300953454.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 202541221613 its reverse (316122145202), we get a palindrome (518663366815).

The spelling of 202541221613 in words is "two hundred two billion, five hundred forty-one million, two hundred twenty-one thousand, six hundred thirteen".