113203202021 has 12 divisors (see below), whose sum is σ = 141815001132. Its totient is φ = 89567368128.

The previous prime is 113203202003. The next prime is 113203202029. The reversal of 113203202021 is 120202302311.

It can be written as a sum of positive squares in 2 ways, for example, as 22812779521 + 90390422500 = 151039^2 + 300650^2 .

It is not a de Polignac number, because 113203202021 - 2⁶ = 113203201957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (113203202029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 88855880 + ... + 88857153.

It is an arithmetic number, because the mean of its divisors is an integer number (11817916761).

Almost surely, 2^113203202021 is an apocalyptic number.

It is an amenable number.

113203202021 is a deficient number, since it is larger than the sum of its proper divisors (28611799111).

113203202021 is a wasteful number, since it uses less digits than its factorization.

113203202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177713060 (or 177713053 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 113203202021 its reverse (120202302311), we get a palindrome (233405504332).

The spelling of 113203202021 in words is "one hundred thirteen billion, two hundred three million, two hundred two thousand, twenty-one".