31123213330 has 32 divisors (see below), whose sum is σ = 61126705728. Its totient is φ = 11315304000.

The previous prime is 31123213309. The next prime is 31123213339. The reversal of 31123213330 is 3331232113.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (31123213339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 596805 + ... + 646855.

It is an arithmetic number, because the mean of its divisors is an integer number (1910209554).

Almost surely, 2^31123213330 is an apocalyptic number.

31123213330 is a deficient number, since it is larger than the sum of its proper divisors (30003492398).

31123213330 is a wasteful number, since it uses less digits than its factorization.

31123213330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55722.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31123213330 its reverse (3331232113), we get a palindrome (34454445443).

The spelling of 31123213330 in words is "thirty-one billion, one hundred twenty-three million, two hundred thirteen thousand, three hundred thirty".