31123121330 has 16 divisors (see below), whose sum is σ = 64024706880. Its totient is φ = 10670784432.

The previous prime is 31123121327. The next prime is 31123121339. The reversal of 31123121330 is 3312132113.

It is not an unprimeable number, because it can be changed into a prime (31123121339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222307940 + ... + 222308079.

It is an arithmetic number, because the mean of its divisors is an integer number (4001544180).

Almost surely, 2^31123121330 is an apocalyptic number.

31123121330 is an abundant number, since it is smaller than the sum of its proper divisors (32901585550).

31123121330 is a wasteful number, since it uses less digits than its factorization.

31123121330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444616033.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31123121330 its reverse (3312132113), we get a palindrome (34435253443).

The spelling of 31123121330 in words is "thirty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, three hundred thirty".