31123020203203 has 4 divisors (see below), whose sum is σ = 31294970591248. Its totient is φ = 30951069815160.

The previous prime is 31123020203201. The next prime is 31123020203273. The reversal of 31123020203203 is 30230202032113.

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

It is a cyclic number.

It is not a de Polignac number, because 31123020203203 - 2¹ = 31123020203201 is a prime.

It is a super-2 number, since 2×31123020203203² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123020203201) 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, 85975193751 + ... + 85975194112.

It is an arithmetic number, because the mean of its divisors is an integer number (7823742647812).

Almost surely, 2^{31123020203203} is an apocalyptic number.

31123020203203 is a deficient number, since it is larger than the sum of its proper divisors (171950388045).

31123020203203 is a wasteful number, since it uses less digits than its factorization.

31123020203203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171950388044.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 31123020203203 its reverse (30230202032113), we get a palindrome (61353222235316).

The spelling of 31123020203203 in words is "thirty-one trillion, one hundred twenty-three billion, twenty million, two hundred three thousand, two hundred three".