31103023313021 has 4 divisors (see below), whose sum is σ = 33930570886944. Its totient is φ = 28275475739100.

The previous prime is 31103023312969. The next prime is 31103023313039. The reversal of 31103023313021 is 12031332030113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31103023313021 - 2³⁰ = 31101949571197 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 (31103023313221) 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, 1413773786945 + ... + 1413773786966.

It is an arithmetic number, because the mean of its divisors is an integer number (8482642721736).

Almost surely, 2^{31103023313021} is an apocalyptic number.

It is an amenable number.

31103023313021 is a deficient number, since it is larger than the sum of its proper divisors (2827547573923).

31103023313021 is a wasteful number, since it uses less digits than its factorization.

31103023313021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2827547573922.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 31103023313021 its reverse (12031332030113), we get a palindrome (43134355343134).

The spelling of 31103023313021 in words is "thirty-one trillion, one hundred three billion, twenty-three million, three hundred thirteen thousand, twenty-one".