31221313042 has 8 divisors (see below), whose sum is σ = 49586791356. Its totient is φ = 14692382592.

The previous prime is 31221313037. The next prime is 31221313073. The reversal of 31221313042 is 24031312213.

It can be written as a sum of positive squares in 2 ways, for example, as 30600854761 + 620458281 = 174931^2 + 24909^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459136923 + ... + 459136990.

Almost surely, 2^31221313042 is an apocalyptic number.

31221313042 is a deficient number, since it is larger than the sum of its proper divisors (18365478314).

31221313042 is a wasteful number, since it uses less digits than its factorization.

31221313042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 918273932.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31221313042 its reverse (24031312213), we get a palindrome (55252625255).

The spelling of 31221313042 in words is "thirty-one billion, two hundred twenty-one million, three hundred thirteen thousand, forty-two".