31203423433121 has 4 divisors (see below), whose sum is σ = 31203438215700. Its totient is φ = 31203408650544.

The previous prime is 31203423433111. The next prime is 31203423433129. The reversal of 31203423433121 is 12133432430213.

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 19453171830625 + 11750251602496 = 4410575^2 + 3427864^2 .

It is a cyclic number.

It is not a de Polignac number, because 31203423433121 - 2¹⁸ = 31203423170977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31203423433129) 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, 3564686 + ... + 8666823.

It is an arithmetic number, because the mean of its divisors is an integer number (7800859553925).

Almost surely, 2^{31203423433121} is an apocalyptic number.

It is an amenable number.

31203423433121 is a deficient number, since it is larger than the sum of its proper divisors (14782579).

31203423433121 is a wasteful number, since it uses less digits than its factorization.

31203423433121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14782578.

The product of its (nonzero) digits is 31104, while the sum is 32.

Adding to 31203423433121 its reverse (12133432430213), we get a palindrome (43336855863334).

It can be divided in two parts, 31203 and 423433121, that added together give a palindrome (423464324).

The spelling of 31203423433121 in words is "thirty-one trillion, two hundred three billion, four hundred twenty-three million, four hundred thirty-three thousand, one hundred twenty-one".