203121331432013 has 4 divisors (see below), whose sum is σ = 203131719695388. Its totient is φ = 203110943168640.

The previous prime is 203121331431959. The next prime is 203121331432027. The reversal of 203121331432013 is 310234133121302.

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 160180335000169 + 42940996431844 = 12656237^2 + 6552938^2 .

It is a cyclic number.

It is not a de Polignac number, because 203121331432013 - 2¹⁰ = 203121331430989 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 (203121331432043) 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, 5194102358 + ... + 5194141463.

It is an arithmetic number, because the mean of its divisors is an integer number (50782929923847).

Almost surely, 2^{203121331432013} is an apocalyptic number.

It is an amenable number.

203121331432013 is a deficient number, since it is larger than the sum of its proper divisors (10388263375).

203121331432013 is a wasteful number, since it uses less digits than its factorization.

203121331432013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10388263374.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 203121331432013 its reverse (310234133121302), we get a palindrome (513355464553315).

The spelling of 203121331432013 in words is "two hundred three trillion, one hundred twenty-one billion, three hundred thirty-one million, four hundred thirty-two thousand, thirteen".